diff options
143 files changed, 4316 insertions, 1083 deletions
diff --git a/src/tools/clippy/.github/ISSUE_TEMPLATE/new_lint.md b/src/tools/clippy/.github/ISSUE_TEMPLATE/new_lint.md index 70445d7ef25..98fd0df685f 100644 --- a/src/tools/clippy/.github/ISSUE_TEMPLATE/new_lint.md +++ b/src/tools/clippy/.github/ISSUE_TEMPLATE/new_lint.md @@ -12,7 +12,7 @@ labels: L-lint - Kind: *See <https://github.com/rust-lang/rust-clippy/blob/master/README.md#clippy> for list of lint kinds* -*What benefit of this lint over old code?* +*What is the advantage of the recommended code over the original code* For example: - Remove bounce checking inserted by ... diff --git a/src/tools/clippy/.github/workflows/clippy_bors.yml b/src/tools/clippy/.github/workflows/clippy_bors.yml index 0c80394f03e..fd0cd7a1890 100644 --- a/src/tools/clippy/.github/workflows/clippy_bors.yml +++ b/src/tools/clippy/.github/workflows/clippy_bors.yml @@ -240,7 +240,8 @@ jobs: - 'Geal/nom' - 'rust-lang/stdarch' - 'serde-rs/serde' - - 'chronotope/chrono' + # FIXME: chrono currently cannot be compiled with `--all-targets` + # - 'chronotope/chrono' - 'hyperium/hyper' - 'rust-random/rand' - 'rust-lang/futures-rs' diff --git a/src/tools/clippy/CHANGELOG.md b/src/tools/clippy/CHANGELOG.md index adc945a6944..5d08b44ba40 100644 --- a/src/tools/clippy/CHANGELOG.md +++ b/src/tools/clippy/CHANGELOG.md @@ -1352,6 +1352,7 @@ Released 2018-09-13 [`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask [`bind_instead_of_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#bind_instead_of_map [`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name +[`blanket_clippy_restriction_lints`]: https://rust-lang.github.io/rust-clippy/master/index.html#blanket_clippy_restriction_lints [`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions [`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison [`borrow_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_interior_mutable_const @@ -1508,9 +1509,11 @@ Released 2018-09-13 [`map_clone`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_clone [`map_entry`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_entry [`map_flatten`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_flatten +[`map_identity`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_identity [`map_unwrap_or`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_unwrap_or [`match_as_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_as_ref [`match_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_bool +[`match_like_matches_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_like_matches_macro [`match_on_vec_items`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_on_vec_items [`match_overlapping_arm`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_overlapping_arm [`match_ref_pats`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats @@ -1575,6 +1578,7 @@ Released 2018-09-13 [`op_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#op_ref [`option_as_ref_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_as_ref_deref [`option_env_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_env_unwrap +[`option_if_let_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_if_let_else [`option_map_or_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_or_none [`option_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unit_fn [`option_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_option @@ -1586,6 +1590,7 @@ Released 2018-09-13 [`panicking_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#panicking_unwrap [`partialeq_ne_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_ne_impl [`path_buf_push_overwrite`]: https://rust-lang.github.io/rust-clippy/master/index.html#path_buf_push_overwrite +[`pattern_type_mismatch`]: https://rust-lang.github.io/rust-clippy/master/index.html#pattern_type_mismatch [`possible_missing_comma`]: https://rust-lang.github.io/rust-clippy/master/index.html#possible_missing_comma [`precedence`]: https://rust-lang.github.io/rust-clippy/master/index.html#precedence [`print_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#print_literal @@ -1612,6 +1617,7 @@ Released 2018-09-13 [`redundant_static_lifetimes`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_static_lifetimes [`ref_in_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#ref_in_deref [`regex_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#regex_macro +[`repeat_once`]: https://rust-lang.github.io/rust-clippy/master/index.html#repeat_once [`replace_consts`]: https://rust-lang.github.io/rust-clippy/master/index.html#replace_consts [`rest_pat_in_fully_bound_structs`]: https://rust-lang.github.io/rust-clippy/master/index.html#rest_pat_in_fully_bound_structs [`result_map_or_into_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_or_into_option diff --git a/src/tools/clippy/CONTRIBUTING.md b/src/tools/clippy/CONTRIBUTING.md index 9f7bdcb1be7..69a734e4ee4 100644 --- a/src/tools/clippy/CONTRIBUTING.md +++ b/src/tools/clippy/CONTRIBUTING.md @@ -245,7 +245,7 @@ this to work, you will need the fix of `git subtree` available [here][gitgitgadget-pr]. [gitgitgadget-pr]: https://github.com/gitgitgadget/git/pull/493 -[subtree]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#external-dependencies-subtree +[subtree]: https://rustc-dev-guide.rust-lang.org/contributing.html#external-dependencies-subtree [`rust-lang/rust`]: https://github.com/rust-lang/rust ## Issue and PR triage diff --git a/src/tools/clippy/clippy_lints/src/attrs.rs b/src/tools/clippy/clippy_lints/src/attrs.rs index 3f7d6ba6467..ef01364b7d9 100644 --- a/src/tools/clippy/clippy_lints/src/attrs.rs +++ b/src/tools/clippy/clippy_lints/src/attrs.rs @@ -2,8 +2,8 @@ use crate::reexport::Name; use crate::utils::{ - first_line_of_span, is_present_in_source, match_def_path, paths, snippet_opt, span_lint, span_lint_and_sugg, - span_lint_and_then, without_block_comments, + first_line_of_span, is_present_in_source, match_def_path, paths, snippet_opt, span_lint, span_lint_and_help, + span_lint_and_sugg, span_lint_and_then, without_block_comments, }; use if_chain::if_chain; use rustc_ast::ast::{AttrKind, AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem}; @@ -17,7 +17,7 @@ use rustc_middle::lint::in_external_macro; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; -use rustc_span::symbol::Symbol; +use rustc_span::symbol::{Symbol, SymbolStr}; use semver::Version; static UNIX_SYSTEMS: &[&str] = &[ @@ -183,6 +183,29 @@ declare_clippy_lint! { } declare_clippy_lint! { + /// **What it does:** Checks for `warn`/`deny`/`forbid` attributes targeting the whole clippy::restriction category. + /// + /// **Why is this bad?** Restriction lints sometimes are in contrast with other lints or even go against idiomatic rust. + /// These lints should only be enabled on a lint-by-lint basis and with careful consideration. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// Bad: + /// ```rust + /// #![deny(clippy::restriction)] + /// ``` + /// + /// Good: + /// ```rust + /// #![deny(clippy::as_conversions)] + /// ``` + pub BLANKET_CLIPPY_RESTRICTION_LINTS, + style, + "enabling the complete restriction group" +} + +declare_clippy_lint! { /// **What it does:** Checks for `#[cfg_attr(rustfmt, rustfmt_skip)]` and suggests to replace it /// with `#[rustfmt::skip]`. /// @@ -249,15 +272,17 @@ declare_lint_pass!(Attributes => [ DEPRECATED_SEMVER, USELESS_ATTRIBUTE, UNKNOWN_CLIPPY_LINTS, + BLANKET_CLIPPY_RESTRICTION_LINTS, ]); impl<'tcx> LateLintPass<'tcx> for Attributes { fn check_attribute(&mut self, cx: &LateContext<'tcx>, attr: &'tcx Attribute) { if let Some(items) = &attr.meta_item_list() { if let Some(ident) = attr.ident() { - match &*ident.as_str() { + let ident = &*ident.as_str(); + match ident { "allow" | "warn" | "deny" | "forbid" => { - check_clippy_lint_names(cx, items); + check_clippy_lint_names(cx, ident, items); }, _ => {}, } @@ -363,38 +388,43 @@ impl<'tcx> LateLintPass<'tcx> for Attributes { } } -#[allow(clippy::single_match_else)] -fn check_clippy_lint_names(cx: &LateContext<'_>, items: &[NestedMetaItem]) { - let lint_store = cx.lints(); - for lint in items { +fn check_clippy_lint_names(cx: &LateContext<'_>, ident: &str, items: &[NestedMetaItem]) { + fn extract_name(lint: &NestedMetaItem) -> Option<SymbolStr> { if_chain! { if let Some(meta_item) = lint.meta_item(); if meta_item.path.segments.len() > 1; if let tool_name = meta_item.path.segments[0].ident; if tool_name.as_str() == "clippy"; - let name = meta_item.path.segments.last().unwrap().ident.name; - if let CheckLintNameResult::Tool(Err((None, _))) = lint_store.check_lint_name( - &name.as_str(), - Some(tool_name.name), - ); + let lint_name = meta_item.path.segments.last().unwrap().ident.name; then { + return Some(lint_name.as_str()); + } + } + None + } + + let lint_store = cx.lints(); + for lint in items { + if let Some(lint_name) = extract_name(lint) { + if let CheckLintNameResult::Tool(Err((None, _))) = + lint_store.check_lint_name(&lint_name, Some(sym!(clippy))) + { span_lint_and_then( cx, UNKNOWN_CLIPPY_LINTS, lint.span(), - &format!("unknown clippy lint: clippy::{}", name), + &format!("unknown clippy lint: clippy::{}", lint_name), |diag| { - let name_lower = name.as_str().to_lowercase(); - let symbols = lint_store.get_lints().iter().map( - |l| Symbol::intern(&l.name_lower()) - ).collect::<Vec<_>>(); - let sugg = find_best_match_for_name( - symbols.iter(), - &format!("clippy::{}", name_lower), - None, - ); - if name.as_str().chars().any(char::is_uppercase) - && lint_store.find_lints(&format!("clippy::{}", name_lower)).is_ok() { + let name_lower = lint_name.to_lowercase(); + let symbols = lint_store + .get_lints() + .iter() + .map(|l| Symbol::intern(&l.name_lower())) + .collect::<Vec<_>>(); + let sugg = find_best_match_for_name(symbols.iter(), &format!("clippy::{}", name_lower), None); + if lint_name.chars().any(char::is_uppercase) + && lint_store.find_lints(&format!("clippy::{}", name_lower)).is_ok() + { diag.span_suggestion( lint.span(), "lowercase the lint name", @@ -409,10 +439,19 @@ fn check_clippy_lint_names(cx: &LateContext<'_>, items: &[NestedMetaItem]) { Applicability::MachineApplicable, ); } - } + }, + ); + } else if lint_name == "restriction" && ident != "allow" { + span_lint_and_help( + cx, + BLANKET_CLIPPY_RESTRICTION_LINTS, + lint.span(), + "restriction lints are not meant to be all enabled", + None, + "try enabling only the lints you really need", ); } - }; + } } } @@ -442,15 +481,14 @@ fn is_relevant_trait(cx: &LateContext<'_>, item: &TraitItem<'_>) -> bool { } fn is_relevant_block(cx: &LateContext<'_>, tables: &ty::TypeckTables<'_>, block: &Block<'_>) -> bool { - if let Some(stmt) = block.stmts.first() { - match &stmt.kind { + block.stmts.first().map_or( + block.expr.as_ref().map_or(false, |e| is_relevant_expr(cx, tables, e)), + |stmt| match &stmt.kind { StmtKind::Local(_) => true, StmtKind::Expr(expr) | StmtKind::Semi(expr) => is_relevant_expr(cx, tables, expr), _ => false, - } - } else { - block.expr.as_ref().map_or(false, |e| is_relevant_expr(cx, tables, e)) - } + }, + ) } fn is_relevant_expr(cx: &LateContext<'_>, tables: &ty::TypeckTables<'_>, expr: &Expr<'_>) -> bool { @@ -460,11 +498,10 @@ fn is_relevant_expr(cx: &LateContext<'_>, tables: &ty::TypeckTables<'_>, expr: & ExprKind::Ret(None) | ExprKind::Break(_, None) => false, ExprKind::Call(path_expr, _) => { if let ExprKind::Path(qpath) = &path_expr.kind { - if let Some(fun_id) = tables.qpath_res(qpath, path_expr.hir_id).opt_def_id() { - !match_def_path(cx, fun_id, &paths::BEGIN_PANIC) - } else { - true - } + tables + .qpath_res(qpath, path_expr.hir_id) + .opt_def_id() + .map_or(true, |fun_id| !match_def_path(cx, fun_id, &paths::BEGIN_PANIC)) } else { true } diff --git a/src/tools/clippy/clippy_lints/src/await_holding_lock.rs b/src/tools/clippy/clippy_lints/src/await_holding_lock.rs index 20b91bc0f1b..d337262dfa6 100644 --- a/src/tools/clippy/clippy_lints/src/await_holding_lock.rs +++ b/src/tools/clippy/clippy_lints/src/await_holding_lock.rs @@ -11,7 +11,7 @@ declare_clippy_lint! { /// non-async-aware MutexGuard. /// /// **Why is this bad?** The Mutex types found in syd::sync and parking_lot - /// are not designed to operator in an async context across await points. + /// are not designed to operate in an async context across await points. /// /// There are two potential solutions. One is to use an asynx-aware Mutex /// type. Many asynchronous foundation crates provide such a Mutex type. The diff --git a/src/tools/clippy/clippy_lints/src/collapsible_if.rs b/src/tools/clippy/clippy_lints/src/collapsible_if.rs index 8090f4673aa..42bff564de0 100644 --- a/src/tools/clippy/clippy_lints/src/collapsible_if.rs +++ b/src/tools/clippy/clippy_lints/src/collapsible_if.rs @@ -115,7 +115,7 @@ fn check_collapsible_maybe_if_let(cx: &EarlyContext<'_>, else_: &ast::Expr) { COLLAPSIBLE_IF, block.span, "this `else { if .. }` block can be collapsed", - "try", + "collapse nested if block", snippet_block_with_applicability(cx, else_.span, "..", Some(block.span), &mut applicability).into_owned(), applicability, ); @@ -142,7 +142,7 @@ fn check_collapsible_no_if_let(cx: &EarlyContext<'_>, expr: &ast::Expr, check: & let rhs = Sugg::ast(cx, check_inner, ".."); diag.span_suggestion( expr.span, - "try", + "collapse nested if block", format!( "if {} {}", lhs.and(&rhs), diff --git a/src/tools/clippy/clippy_lints/src/comparison_chain.rs b/src/tools/clippy/clippy_lints/src/comparison_chain.rs index 26476af4cb6..25ccabc1c88 100644 --- a/src/tools/clippy/clippy_lints/src/comparison_chain.rs +++ b/src/tools/clippy/clippy_lints/src/comparison_chain.rs @@ -122,8 +122,5 @@ impl<'tcx> LateLintPass<'tcx> for ComparisonChain { } fn kind_is_cmp(kind: BinOpKind) -> bool { - match kind { - BinOpKind::Lt | BinOpKind::Gt | BinOpKind::Eq => true, - _ => false, - } + matches!(kind, BinOpKind::Lt | BinOpKind::Gt | BinOpKind::Eq) } diff --git a/src/tools/clippy/clippy_lints/src/deprecated_lints.rs b/src/tools/clippy/clippy_lints/src/deprecated_lints.rs index 6e8ca647dd7..818d8188a78 100644 --- a/src/tools/clippy/clippy_lints/src/deprecated_lints.rs +++ b/src/tools/clippy/clippy_lints/src/deprecated_lints.rs @@ -153,5 +153,13 @@ declare_deprecated_lint! { /// /// **Deprecation reason:** Associated-constants are now preferred. pub REPLACE_CONSTS, - "associated-constants `MIN`/`MAX` of integers are prefer to `{min,max}_value()` and module constants" + "associated-constants `MIN`/`MAX` of integers are prefered to `{min,max}_value()` and module constants" +} + +declare_deprecated_lint! { + /// **What it does:** Nothing. This lint has been deprecated. + /// + /// **Deprecation reason:** The regex! macro does not exist anymore. + pub REGEX_MACRO, + "the regex! macro has been removed from the regex crate in 2018" } diff --git a/src/tools/clippy/clippy_lints/src/dereference.rs b/src/tools/clippy/clippy_lints/src/dereference.rs index d740d88a77d..323cad7fa1a 100644 --- a/src/tools/clippy/clippy_lints/src/dereference.rs +++ b/src/tools/clippy/clippy_lints/src/dereference.rs @@ -73,9 +73,10 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing { fn lint_deref(cx: &LateContext<'_>, method_name: &str, call_expr: &Expr<'_>, var_span: Span, expr_span: Span) { match method_name { "deref" => { - if cx.tcx.lang_items().deref_trait().map_or(false, |id| { + let impls_deref_trait = cx.tcx.lang_items().deref_trait().map_or(false, |id| { implements_trait(cx, cx.tables().expr_ty(&call_expr), id, &[]) - }) { + }); + if impls_deref_trait { span_lint_and_sugg( cx, EXPLICIT_DEREF_METHODS, @@ -88,9 +89,10 @@ fn lint_deref(cx: &LateContext<'_>, method_name: &str, call_expr: &Expr<'_>, var } }, "deref_mut" => { - if cx.tcx.lang_items().deref_mut_trait().map_or(false, |id| { + let impls_deref_mut_trait = cx.tcx.lang_items().deref_mut_trait().map_or(false, |id| { implements_trait(cx, cx.tables().expr_ty(&call_expr), id, &[]) - }) { + }); + if impls_deref_mut_trait { span_lint_and_sugg( cx, EXPLICIT_DEREF_METHODS, diff --git a/src/tools/clippy/clippy_lints/src/eq_op.rs b/src/tools/clippy/clippy_lints/src/eq_op.rs index cbc93d772dd..01eff28cb19 100644 --- a/src/tools/clippy/clippy_lints/src/eq_op.rs +++ b/src/tools/clippy/clippy_lints/src/eq_op.rs @@ -214,20 +214,20 @@ impl<'tcx> LateLintPass<'tcx> for EqOp { } fn is_valid_operator(op: BinOp) -> bool { - match op.node { + matches!( + op.node, BinOpKind::Sub - | BinOpKind::Div - | BinOpKind::Eq - | BinOpKind::Lt - | BinOpKind::Le - | BinOpKind::Gt - | BinOpKind::Ge - | BinOpKind::Ne - | BinOpKind::And - | BinOpKind::Or - | BinOpKind::BitXor - | BinOpKind::BitAnd - | BinOpKind::BitOr => true, - _ => false, - } + | BinOpKind::Div + | BinOpKind::Eq + | BinOpKind::Lt + | BinOpKind::Le + | BinOpKind::Gt + | BinOpKind::Ge + | BinOpKind::Ne + | BinOpKind::And + | BinOpKind::Or + | BinOpKind::BitXor + | BinOpKind::BitAnd + | BinOpKind::BitOr + ) } diff --git a/src/tools/clippy/clippy_lints/src/escape.rs b/src/tools/clippy/clippy_lints/src/escape.rs index b10181062ff..ceb3c40d869 100644 --- a/src/tools/clippy/clippy_lints/src/escape.rs +++ b/src/tools/clippy/clippy_lints/src/escape.rs @@ -105,10 +105,7 @@ fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool { _ => return false, } - match map.find(map.get_parent_node(id)) { - Some(Node::Param(_)) => true, - _ => false, - } + matches!(map.find(map.get_parent_node(id)), Some(Node::Param(_))) } impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> { diff --git a/src/tools/clippy/clippy_lints/src/eta_reduction.rs b/src/tools/clippy/clippy_lints/src/eta_reduction.rs index ceed6a74c4f..fb26b9fc27d 100644 --- a/src/tools/clippy/clippy_lints/src/eta_reduction.rs +++ b/src/tools/clippy/clippy_lints/src/eta_reduction.rs @@ -175,10 +175,7 @@ fn get_ufcs_type_name(cx: &LateContext<'_>, method_def_id: def_id::DefId, self_a fn match_borrow_depth(lhs: Ty<'_>, rhs: Ty<'_>) -> bool { match (&lhs.kind, &rhs.kind) { (ty::Ref(_, t1, mut1), ty::Ref(_, t2, mut2)) => mut1 == mut2 && match_borrow_depth(&t1, &t2), - (l, r) => match (l, r) { - (ty::Ref(_, _, _), _) | (_, ty::Ref(_, _, _)) => false, - (_, _) => true, - }, + (l, r) => !matches!((l, r), (ty::Ref(_, _, _), _) | (_, ty::Ref(_, _, _))), } } diff --git a/src/tools/clippy/clippy_lints/src/floating_point_arithmetic.rs b/src/tools/clippy/clippy_lints/src/floating_point_arithmetic.rs index 4efd0689267..3087d6a940a 100644 --- a/src/tools/clippy/clippy_lints/src/floating_point_arithmetic.rs +++ b/src/tools/clippy/clippy_lints/src/floating_point_arithmetic.rs @@ -1,11 +1,11 @@ use crate::consts::{ constant, constant_simple, Constant, - Constant::{F32, F64}, + Constant::{Int, F32, F64}, }; -use crate::utils::{higher, numeric_literal, span_lint_and_sugg, sugg, SpanlessEq}; +use crate::utils::{get_parent_expr, higher, numeric_literal, span_lint_and_sugg, sugg, SpanlessEq}; use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp}; +use rustc_hir::{BinOpKind, Expr, ExprKind, PathSegment, UnOp}; use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; @@ -293,6 +293,121 @@ fn check_powf(cx: &LateContext<'_>, expr: &Expr<'_>, args: &[Expr<'_>]) { } } +fn check_powi(cx: &LateContext<'_>, expr: &Expr<'_>, args: &[Expr<'_>]) { + if let Some((value, _)) = constant(cx, cx.tables(), &args[1]) { + if value == Int(2) { + if let Some(parent) = get_parent_expr(cx, expr) { + if let Some(grandparent) = get_parent_expr(cx, parent) { + if let ExprKind::MethodCall(PathSegment { ident: method_name, .. }, _, args, _) = grandparent.kind { + if method_name.as_str() == "sqrt" && detect_hypot(cx, args).is_some() { + return; + } + } + } + + if let ExprKind::Binary( + Spanned { + node: BinOpKind::Add, .. + }, + ref lhs, + ref rhs, + ) = parent.kind + { + let other_addend = if lhs.hir_id == expr.hir_id { rhs } else { lhs }; + + span_lint_and_sugg( + cx, + SUBOPTIMAL_FLOPS, + parent.span, + "square can be computed more efficiently", + "consider using", + format!( + "{}.mul_add({}, {})", + Sugg::hir(cx, &args[0], ".."), + Sugg::hir(cx, &args[0], ".."), + Sugg::hir(cx, &other_addend, ".."), + ), + Applicability::MachineApplicable, + ); + + return; + } + } + + span_lint_and_sugg( + cx, + SUBOPTIMAL_FLOPS, + expr.span, + "square can be computed more efficiently", + "consider using", + format!("{} * {}", Sugg::hir(cx, &args[0], ".."), Sugg::hir(cx, &args[0], "..")), + Applicability::MachineApplicable, + ); + } + } +} + +fn detect_hypot(cx: &LateContext<'_>, args: &[Expr<'_>]) -> Option<String> { + if let ExprKind::Binary( + Spanned { + node: BinOpKind::Add, .. + }, + ref add_lhs, + ref add_rhs, + ) = args[0].kind + { + // check if expression of the form x * x + y * y + if_chain! { + if let ExprKind::Binary(Spanned { node: BinOpKind::Mul, .. }, ref lmul_lhs, ref lmul_rhs) = add_lhs.kind; + if let ExprKind::Binary(Spanned { node: BinOpKind::Mul, .. }, ref rmul_lhs, ref rmul_rhs) = add_rhs.kind; + if are_exprs_equal(cx, lmul_lhs, lmul_rhs); + if are_exprs_equal(cx, rmul_lhs, rmul_rhs); + then { + return Some(format!("{}.hypot({})", Sugg::hir(cx, &lmul_lhs, ".."), Sugg::hir(cx, &rmul_lhs, ".."))); + } + } + + // check if expression of the form x.powi(2) + y.powi(2) + if_chain! { + if let ExprKind::MethodCall( + PathSegment { ident: lmethod_name, .. }, + ref _lspan, + ref largs, + _ + ) = add_lhs.kind; + if let ExprKind::MethodCall( + PathSegment { ident: rmethod_name, .. }, + ref _rspan, + ref rargs, + _ + ) = add_rhs.kind; + if lmethod_name.as_str() == "powi" && rmethod_name.as_str() == "powi"; + if let Some((lvalue, _)) = constant(cx, cx.tables(), &largs[1]); + if let Some((rvalue, _)) = constant(cx, cx.tables(), &rargs[1]); + if Int(2) == lvalue && Int(2) == rvalue; + then { + return Some(format!("{}.hypot({})", Sugg::hir(cx, &largs[0], ".."), Sugg::hir(cx, &rargs[0], ".."))); + } + } + } + + None +} + +fn check_hypot(cx: &LateContext<'_>, expr: &Expr<'_>, args: &[Expr<'_>]) { + if let Some(message) = detect_hypot(cx, args) { + span_lint_and_sugg( + cx, + IMPRECISE_FLOPS, + expr.span, + "hypotenuse can be computed more accurately", + "consider using", + message, + Applicability::MachineApplicable, + ); + } +} + // TODO: Lint expressions of the form `x.exp() - y` where y > 1 // and suggest usage of `x.exp_m1() - (y - 1)` instead fn check_expm1(cx: &LateContext<'_>, expr: &Expr<'_>) { @@ -344,6 +459,14 @@ fn check_mul_add(cx: &LateContext<'_>, expr: &Expr<'_>) { rhs, ) = &expr.kind { + if let Some(parent) = get_parent_expr(cx, expr) { + if let ExprKind::MethodCall(PathSegment { ident: method_name, .. }, _, args, _) = parent.kind { + if method_name.as_str() == "sqrt" && detect_hypot(cx, args).is_some() { + return; + } + } + } + let (recv, arg1, arg2) = if let Some((inner_lhs, inner_rhs)) = is_float_mul_expr(cx, lhs) { (inner_lhs, inner_rhs, rhs) } else if let Some((inner_lhs, inner_rhs)) = is_float_mul_expr(cx, rhs) { @@ -479,6 +602,100 @@ fn check_custom_abs(cx: &LateContext<'_>, expr: &Expr<'_>) { } } +fn are_same_base_logs(cx: &LateContext<'_>, expr_a: &Expr<'_>, expr_b: &Expr<'_>) -> bool { + if_chain! { + if let ExprKind::MethodCall(PathSegment { ident: method_name_a, .. }, _, ref args_a, _) = expr_a.kind; + if let ExprKind::MethodCall(PathSegment { ident: method_name_b, .. }, _, ref args_b, _) = expr_b.kind; + then { + return method_name_a.as_str() == method_name_b.as_str() && + args_a.len() == args_b.len() && + ( + ["ln", "log2", "log10"].contains(&&*method_name_a.as_str()) || + method_name_a.as_str() == "log" && args_a.len() == 2 && are_exprs_equal(cx, &args_a[1], &args_b[1]) + ); + } + } + + false +} + +fn check_log_division(cx: &LateContext<'_>, expr: &Expr<'_>) { + // check if expression of the form x.logN() / y.logN() + if_chain! { + if let ExprKind::Binary( + Spanned { + node: BinOpKind::Div, .. + }, + lhs, + rhs, + ) = &expr.kind; + if are_same_base_logs(cx, lhs, rhs); + if let ExprKind::MethodCall(_, _, ref largs, _) = lhs.kind; + if let ExprKind::MethodCall(_, _, ref rargs, _) = rhs.kind; + then { + span_lint_and_sugg( + cx, + SUBOPTIMAL_FLOPS, + expr.span, + "log base can be expressed more clearly", + "consider using", + format!("{}.log({})", Sugg::hir(cx, &largs[0], ".."), Sugg::hir(cx, &rargs[0], ".."),), + Applicability::MachineApplicable, + ); + } + } +} + +fn check_radians(cx: &LateContext<'_>, expr: &Expr<'_>) { + if_chain! { + if let ExprKind::Binary( + Spanned { + node: BinOpKind::Div, .. + }, + div_lhs, + div_rhs, + ) = &expr.kind; + if let ExprKind::Binary( + Spanned { + node: BinOpKind::Mul, .. + }, + mul_lhs, + mul_rhs, + ) = &div_lhs.kind; + if let Some((rvalue, _)) = constant(cx, cx.tables(), div_rhs); + if let Some((lvalue, _)) = constant(cx, cx.tables(), mul_rhs); + then { + // TODO: also check for constant values near PI/180 or 180/PI + if (F32(f32_consts::PI) == rvalue || F64(f64_consts::PI) == rvalue) && + (F32(180_f32) == lvalue || F64(180_f64) == lvalue) + { + span_lint_and_sugg( + cx, + SUBOPTIMAL_FLOPS, + expr.span, + "conversion to degrees can be done more accurately", + "consider using", + format!("{}.to_degrees()", Sugg::hir(cx, &mul_lhs, "..")), + Applicability::MachineApplicable, + ); + } else if + (F32(180_f32) == rvalue || F64(180_f64) == rvalue) && + (F32(f32_consts::PI) == lvalue || F64(f64_consts::PI) == lvalue) + { + span_lint_and_sugg( + cx, + SUBOPTIMAL_FLOPS, + expr.span, + "conversion to radians can be done more accurately", + "consider using", + format!("{}.to_radians()", Sugg::hir(cx, &mul_lhs, "..")), + Applicability::MachineApplicable, + ); + } + } + } +} + impl<'tcx> LateLintPass<'tcx> for FloatingPointArithmetic { fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) { if let ExprKind::MethodCall(ref path, _, args, _) = &expr.kind { @@ -489,6 +706,8 @@ impl<'tcx> LateLintPass<'tcx> for FloatingPointArithmetic { "ln" => check_ln1p(cx, expr, args), "log" => check_log_base(cx, expr, args), "powf" => check_powf(cx, expr, args), + "powi" => check_powi(cx, expr, args), + "sqrt" => check_hypot(cx, expr, args), _ => {}, } } @@ -496,6 +715,8 @@ impl<'tcx> LateLintPass<'tcx> for FloatingPointArithmetic { check_expm1(cx, expr); check_mul_add(cx, expr); check_custom_abs(cx, expr); + check_log_division(cx, expr); + check_radians(cx, expr); } } } diff --git a/src/tools/clippy/clippy_lints/src/formatting.rs b/src/tools/clippy/clippy_lints/src/formatting.rs index 156246fb8bb..1bd16e6cce5 100644 --- a/src/tools/clippy/clippy_lints/src/formatting.rs +++ b/src/tools/clippy/clippy_lints/src/formatting.rs @@ -305,18 +305,10 @@ fn check_missing_else(cx: &EarlyContext<'_>, first: &Expr, second: &Expr) { } fn is_block(expr: &Expr) -> bool { - if let ExprKind::Block(..) = expr.kind { - true - } else { - false - } + matches!(expr.kind, ExprKind::Block(..)) } /// Check if the expression is an `if` or `if let` fn is_if(expr: &Expr) -> bool { - if let ExprKind::If(..) = expr.kind { - true - } else { - false - } + matches!(expr.kind, ExprKind::If(..)) } diff --git a/src/tools/clippy/clippy_lints/src/functions.rs b/src/tools/clippy/clippy_lints/src/functions.rs index 3f030dd8422..63133a4872a 100644 --- a/src/tools/clippy/clippy_lints/src/functions.rs +++ b/src/tools/clippy/clippy_lints/src/functions.rs @@ -645,13 +645,7 @@ fn is_mutated_static(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> bool { use hir::ExprKind::{Field, Index, Path}; match e.kind { - Path(ref qpath) => { - if let Res::Local(_) = qpath_res(cx, qpath, e.hir_id) { - false - } else { - true - } - }, + Path(ref qpath) => !matches!(qpath_res(cx, qpath, e.hir_id), Res::Local(_)), Field(ref inner, _) | Index(ref inner, _) => is_mutated_static(cx, inner), _ => false, } diff --git a/src/tools/clippy/clippy_lints/src/if_let_mutex.rs b/src/tools/clippy/clippy_lints/src/if_let_mutex.rs index f911cb68ea5..fbd2eeacc6e 100644 --- a/src/tools/clippy/clippy_lints/src/if_let_mutex.rs +++ b/src/tools/clippy/clippy_lints/src/if_let_mutex.rs @@ -135,13 +135,10 @@ impl<'tcx> Visitor<'tcx> for ArmVisitor<'_, 'tcx> { } } -impl<'tcx> ArmVisitor<'_, 'tcx> { +impl<'tcx, 'l> ArmVisitor<'tcx, 'l> { fn same_mutex(&self, cx: &LateContext<'_>, op_mutex: &Expr<'_>) -> bool { - if let Some(arm_mutex) = self.found_mutex { - SpanlessEq::new(cx).eq_expr(op_mutex, arm_mutex) - } else { - false - } + self.found_mutex + .map_or(false, |arm_mutex| SpanlessEq::new(cx).eq_expr(op_mutex, arm_mutex)) } } diff --git a/src/tools/clippy/clippy_lints/src/len_zero.rs b/src/tools/clippy/clippy_lints/src/len_zero.rs index 26d96428771..1b09328ceab 100644 --- a/src/tools/clippy/clippy_lints/src/len_zero.rs +++ b/src/tools/clippy/clippy_lints/src/len_zero.rs @@ -302,16 +302,12 @@ fn has_is_empty(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { let ty = &walk_ptrs_ty(cx.tables().expr_ty(expr)); match ty.kind { - ty::Dynamic(ref tt, ..) => { - if let Some(principal) = tt.principal() { - cx.tcx - .associated_items(principal.def_id()) - .in_definition_order() - .any(|item| is_is_empty(cx, &item)) - } else { - false - } - }, + ty::Dynamic(ref tt, ..) => tt.principal().map_or(false, |principal| { + cx.tcx + .associated_items(principal.def_id()) + .in_definition_order() + .any(|item| is_is_empty(cx, &item)) + }), ty::Projection(ref proj) => has_is_empty_impl(cx, proj.item_def_id), ty::Adt(id, _) => has_is_empty_impl(cx, id.did), ty::Array(..) | ty::Slice(..) | ty::Str => true, diff --git a/src/tools/clippy/clippy_lints/src/let_and_return.rs b/src/tools/clippy/clippy_lints/src/let_and_return.rs index ddc41f89f8d..fa560ffb980 100644 --- a/src/tools/clippy/clippy_lints/src/let_and_return.rs +++ b/src/tools/clippy/clippy_lints/src/let_and_return.rs @@ -1,6 +1,5 @@ use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_hir::def_id::DefId; use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor}; use rustc_hir::{Block, Expr, ExprKind, PatKind, StmtKind}; use rustc_lint::{LateContext, LateLintPass, LintContext}; @@ -9,7 +8,7 @@ use rustc_middle::lint::in_external_macro; use rustc_middle::ty::subst::GenericArgKind; use rustc_session::{declare_lint_pass, declare_tool_lint}; -use crate::utils::{in_macro, match_qpath, snippet_opt, span_lint_and_then}; +use crate::utils::{fn_def_id, in_macro, match_qpath, snippet_opt, span_lint_and_then}; declare_clippy_lint! { /// **What it does:** Checks for `let`-bindings, which are subsequently @@ -97,22 +96,6 @@ struct BorrowVisitor<'a, 'tcx> { borrows: bool, } -impl BorrowVisitor<'_, '_> { - fn fn_def_id(&self, expr: &Expr<'_>) -> Option<DefId> { - match &expr.kind { - ExprKind::MethodCall(..) => self.cx.tables().type_dependent_def_id(expr.hir_id), - ExprKind::Call( - Expr { - kind: ExprKind::Path(qpath), - .. - }, - .., - ) => self.cx.qpath_res(qpath, expr.hir_id).opt_def_id(), - _ => None, - } - } -} - impl<'tcx> Visitor<'tcx> for BorrowVisitor<'_, 'tcx> { type Map = Map<'tcx>; @@ -121,7 +104,7 @@ impl<'tcx> Visitor<'tcx> for BorrowVisitor<'_, 'tcx> { return; } - if let Some(def_id) = self.fn_def_id(expr) { + if let Some(def_id) = fn_def_id(self.cx, expr) { self.borrows = self .cx .tcx diff --git a/src/tools/clippy/clippy_lints/src/lib.rs b/src/tools/clippy/clippy_lints/src/lib.rs index 501220f28e5..32e79317f82 100644 --- a/src/tools/clippy/clippy_lints/src/lib.rs +++ b/src/tools/clippy/clippy_lints/src/lib.rs @@ -229,6 +229,7 @@ mod main_recursion; mod manual_async_fn; mod manual_non_exhaustive; mod map_clone; +mod map_identity; mod map_unit_fn; mod match_on_vec_items; mod matches; @@ -263,10 +264,12 @@ mod non_copy_const; mod non_expressive_names; mod open_options; mod option_env_unwrap; +mod option_if_let_else; mod overflow_check_conditional; mod panic_unimplemented; mod partialeq_ne_impl; mod path_buf_push_overwrite; +mod pattern_type_mismatch; mod precedence; mod ptr; mod ptr_offset_with_cast; @@ -274,11 +277,11 @@ mod question_mark; mod ranges; mod redundant_clone; mod redundant_field_names; -mod redundant_pattern_matching; mod redundant_pub_crate; mod redundant_static_lifetimes; mod reference; mod regex; +mod repeat_once; mod returns; mod serde_api; mod shadow; @@ -459,7 +462,11 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: ); store.register_removed( "clippy::replace_consts", - "associated-constants `MIN`/`MAX` of integers are prefer to `{min,max}_value()` and module constants", + "associated-constants `MIN`/`MAX` of integers are prefered to `{min,max}_value()` and module constants", + ); + store.register_removed( + "clippy::regex_macro", + "the regex! macro has been removed from the regex crate in 2018", ); // end deprecated lints, do not remove this comment, it’s used in `update_lints` @@ -473,6 +480,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &assign_ops::ASSIGN_OP_PATTERN, &assign_ops::MISREFACTORED_ASSIGN_OP, &atomic_ordering::INVALID_ATOMIC_ORDERING, + &attrs::BLANKET_CLIPPY_RESTRICTION_LINTS, &attrs::DEPRECATED_CFG_ATTR, &attrs::DEPRECATED_SEMVER, &attrs::EMPTY_LINE_AFTER_OUTER_ATTR, @@ -608,17 +616,20 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &manual_async_fn::MANUAL_ASYNC_FN, &manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE, &map_clone::MAP_CLONE, + &map_identity::MAP_IDENTITY, &map_unit_fn::OPTION_MAP_UNIT_FN, &map_unit_fn::RESULT_MAP_UNIT_FN, &match_on_vec_items::MATCH_ON_VEC_ITEMS, &matches::INFALLIBLE_DESTRUCTURING_MATCH, &matches::MATCH_AS_REF, &matches::MATCH_BOOL, + &matches::MATCH_LIKE_MATCHES_MACRO, &matches::MATCH_OVERLAPPING_ARM, &matches::MATCH_REF_PATS, &matches::MATCH_SINGLE_BINDING, &matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS, &matches::MATCH_WILD_ERR_ARM, + &matches::REDUNDANT_PATTERN_MATCHING, &matches::REST_PAT_IN_FULLY_BOUND_STRUCTS, &matches::SINGLE_MATCH, &matches::SINGLE_MATCH_ELSE, @@ -726,6 +737,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &non_expressive_names::SIMILAR_NAMES, &open_options::NONSENSICAL_OPEN_OPTIONS, &option_env_unwrap::OPTION_ENV_UNWRAP, + &option_if_let_else::OPTION_IF_LET_ELSE, &overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL, &panic_unimplemented::PANIC, &panic_unimplemented::PANIC_PARAMS, @@ -734,6 +746,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &panic_unimplemented::UNREACHABLE, &partialeq_ne_impl::PARTIALEQ_NE_IMPL, &path_buf_push_overwrite::PATH_BUF_PUSH_OVERWRITE, + &pattern_type_mismatch::PATTERN_TYPE_MISMATCH, &precedence::PRECEDENCE, &ptr::CMP_NULL, &ptr::MUT_FROM_REF, @@ -746,14 +759,13 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &ranges::REVERSED_EMPTY_RANGES, &redundant_clone::REDUNDANT_CLONE, &redundant_field_names::REDUNDANT_FIELD_NAMES, - &redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING, &redundant_pub_crate::REDUNDANT_PUB_CRATE, &redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES, &reference::DEREF_ADDROF, &reference::REF_IN_DEREF, ®ex::INVALID_REGEX, - ®ex::REGEX_MACRO, ®ex::TRIVIAL_REGEX, + &repeat_once::REPEAT_ONCE, &returns::NEEDLESS_RETURN, &returns::UNUSED_UNIT, &serde_api::SERDE_API_MISUSE, @@ -946,7 +958,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box missing_doc::MissingDoc::new()); store.register_late_pass(|| box missing_inline::MissingInline); store.register_late_pass(|| box if_let_some_result::OkIfLet); - store.register_late_pass(|| box redundant_pattern_matching::RedundantPatternMatching); store.register_late_pass(|| box partialeq_ne_impl::PartialEqNeImpl); store.register_late_pass(|| box unused_io_amount::UnusedIoAmount); let enum_variant_size_threshold = conf.enum_variant_size_threshold; @@ -990,7 +1001,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box checked_conversions::CheckedConversions); store.register_late_pass(|| box integer_division::IntegerDivision); store.register_late_pass(|| box inherent_to_string::InherentToString); - store.register_late_pass(|| box trait_bounds::TraitBounds); + let max_trait_bounds = conf.max_trait_bounds; + store.register_late_pass(move || box trait_bounds::TraitBounds::new(max_trait_bounds)); store.register_late_pass(|| box comparison_chain::ComparisonChain); store.register_late_pass(|| box mut_key::MutableKeyType); store.register_late_pass(|| box modulo_arithmetic::ModuloArithmetic); @@ -1027,7 +1039,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: let array_size_threshold = conf.array_size_threshold; store.register_late_pass(move || box large_stack_arrays::LargeStackArrays::new(array_size_threshold)); store.register_late_pass(move || box large_const_arrays::LargeConstArrays::new(array_size_threshold)); - store.register_late_pass(move || box floating_point_arithmetic::FloatingPointArithmetic); + store.register_late_pass(|| box floating_point_arithmetic::FloatingPointArithmetic); store.register_early_pass(|| box as_conversions::AsConversions); store.register_early_pass(|| box utils::internal_lints::ProduceIce); store.register_late_pass(|| box let_underscore::LetUnderscore); @@ -1043,6 +1055,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box redundant_pub_crate::RedundantPubCrate::default()); store.register_late_pass(|| box unnamed_address::UnnamedAddress); store.register_late_pass(|| box dereference::Dereferencing); + store.register_late_pass(|| box option_if_let_else::OptionIfLetElse); store.register_late_pass(|| box future_not_send::FutureNotSend); store.register_late_pass(|| box utils::internal_lints::CollapsibleCalls); store.register_late_pass(|| box if_let_mutex::IfLetMutex); @@ -1057,6 +1070,9 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: }); store.register_early_pass(|| box unnested_or_patterns::UnnestedOrPatterns); store.register_late_pass(|| box macro_use::MacroUseImports::default()); + store.register_late_pass(|| box map_identity::MapIdentity); + store.register_late_pass(|| box pattern_type_mismatch::PatternTypeMismatch); + store.register_late_pass(|| box repeat_once::RepeatOnce); store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![ LintId::of(&arithmetic::FLOAT_ARITHMETIC), @@ -1090,6 +1106,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&panic_unimplemented::TODO), LintId::of(&panic_unimplemented::UNIMPLEMENTED), LintId::of(&panic_unimplemented::UNREACHABLE), + LintId::of(&pattern_type_mismatch::PATTERN_TYPE_MISMATCH), LintId::of(&shadow::SHADOW_REUSE), LintId::of(&shadow::SHADOW_SAME), LintId::of(&strings::STRING_ADD), @@ -1146,6 +1163,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&needless_continue::NEEDLESS_CONTINUE), LintId::of(&needless_pass_by_value::NEEDLESS_PASS_BY_VALUE), LintId::of(&non_expressive_names::SIMILAR_NAMES), + LintId::of(&option_if_let_else::OPTION_IF_LET_ELSE), + LintId::of(&ranges::RANGE_MINUS_ONE), LintId::of(&ranges::RANGE_PLUS_ONE), LintId::of(&shadow::SHADOW_UNRELATED), LintId::of(&strings::STRING_ADD_ASSIGN), @@ -1186,6 +1205,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&assign_ops::ASSIGN_OP_PATTERN), LintId::of(&assign_ops::MISREFACTORED_ASSIGN_OP), LintId::of(&atomic_ordering::INVALID_ATOMIC_ORDERING), + LintId::of(&attrs::BLANKET_CLIPPY_RESTRICTION_LINTS), LintId::of(&attrs::DEPRECATED_CFG_ATTR), LintId::of(&attrs::DEPRECATED_SEMVER), LintId::of(&attrs::MISMATCHED_TARGET_OS), @@ -1273,13 +1293,16 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&manual_async_fn::MANUAL_ASYNC_FN), LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE), LintId::of(&map_clone::MAP_CLONE), + LintId::of(&map_identity::MAP_IDENTITY), LintId::of(&map_unit_fn::OPTION_MAP_UNIT_FN), LintId::of(&map_unit_fn::RESULT_MAP_UNIT_FN), LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH), LintId::of(&matches::MATCH_AS_REF), + LintId::of(&matches::MATCH_LIKE_MATCHES_MACRO), LintId::of(&matches::MATCH_OVERLAPPING_ARM), LintId::of(&matches::MATCH_REF_PATS), LintId::of(&matches::MATCH_SINGLE_BINDING), + LintId::of(&matches::REDUNDANT_PATTERN_MATCHING), LintId::of(&matches::SINGLE_MATCH), LintId::of(&matches::WILDCARD_IN_OR_PATTERNS), LintId::of(&mem_discriminant::MEM_DISCRIMINANT_NON_ENUM), @@ -1364,18 +1387,16 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ptr::PTR_ARG), LintId::of(&ptr_offset_with_cast::PTR_OFFSET_WITH_CAST), LintId::of(&question_mark::QUESTION_MARK), - LintId::of(&ranges::RANGE_MINUS_ONE), LintId::of(&ranges::RANGE_ZIP_WITH_LEN), LintId::of(&ranges::REVERSED_EMPTY_RANGES), LintId::of(&redundant_clone::REDUNDANT_CLONE), LintId::of(&redundant_field_names::REDUNDANT_FIELD_NAMES), - LintId::of(&redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING), LintId::of(&redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES), LintId::of(&reference::DEREF_ADDROF), LintId::of(&reference::REF_IN_DEREF), LintId::of(®ex::INVALID_REGEX), - LintId::of(®ex::REGEX_MACRO), LintId::of(®ex::TRIVIAL_REGEX), + LintId::of(&repeat_once::REPEAT_ONCE), LintId::of(&returns::NEEDLESS_RETURN), LintId::of(&returns::UNUSED_UNIT), LintId::of(&serde_api::SERDE_API_MISUSE), @@ -1437,6 +1458,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_group(true, "clippy::style", Some("clippy_style"), vec![ LintId::of(&assertions_on_constants::ASSERTIONS_ON_CONSTANTS), LintId::of(&assign_ops::ASSIGN_OP_PATTERN), + LintId::of(&attrs::BLANKET_CLIPPY_RESTRICTION_LINTS), LintId::of(&attrs::UNKNOWN_CLIPPY_LINTS), LintId::of(&bit_mask::VERBOSE_BIT_MASK), LintId::of(&blacklisted_name::BLACKLISTED_NAME), @@ -1470,8 +1492,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE), LintId::of(&map_clone::MAP_CLONE), LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH), + LintId::of(&matches::MATCH_LIKE_MATCHES_MACRO), LintId::of(&matches::MATCH_OVERLAPPING_ARM), LintId::of(&matches::MATCH_REF_PATS), + LintId::of(&matches::REDUNDANT_PATTERN_MATCHING), LintId::of(&matches::SINGLE_MATCH), LintId::of(&mem_replace::MEM_REPLACE_OPTION_WITH_NONE), LintId::of(&mem_replace::MEM_REPLACE_WITH_DEFAULT), @@ -1508,9 +1532,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ptr::PTR_ARG), LintId::of(&question_mark::QUESTION_MARK), LintId::of(&redundant_field_names::REDUNDANT_FIELD_NAMES), - LintId::of(&redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING), LintId::of(&redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES), - LintId::of(®ex::REGEX_MACRO), LintId::of(®ex::TRIVIAL_REGEX), LintId::of(&returns::NEEDLESS_RETURN), LintId::of(&returns::UNUSED_UNIT), @@ -1550,6 +1572,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::EXPLICIT_COUNTER_LOOP), LintId::of(&loops::MUT_RANGE_BOUND), LintId::of(&loops::WHILE_LET_LOOP), + LintId::of(&map_identity::MAP_IDENTITY), LintId::of(&map_unit_fn::OPTION_MAP_UNIT_FN), LintId::of(&map_unit_fn::RESULT_MAP_UNIT_FN), LintId::of(&matches::MATCH_AS_REF), @@ -1580,10 +1603,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&partialeq_ne_impl::PARTIALEQ_NE_IMPL), LintId::of(&precedence::PRECEDENCE), LintId::of(&ptr_offset_with_cast::PTR_OFFSET_WITH_CAST), - LintId::of(&ranges::RANGE_MINUS_ONE), LintId::of(&ranges::RANGE_ZIP_WITH_LEN), LintId::of(&reference::DEREF_ADDROF), LintId::of(&reference::REF_IN_DEREF), + LintId::of(&repeat_once::REPEAT_ONCE), LintId::of(&swap::MANUAL_SWAP), LintId::of(&temporary_assignment::TEMPORARY_ASSIGNMENT), LintId::of(&transmute::CROSSPOINTER_TRANSMUTE), diff --git a/src/tools/clippy/clippy_lints/src/lifetimes.rs b/src/tools/clippy/clippy_lints/src/lifetimes.rs index a79f94855bd..168f9f953e4 100644 --- a/src/tools/clippy/clippy_lints/src/lifetimes.rs +++ b/src/tools/clippy/clippy_lints/src/lifetimes.rs @@ -129,10 +129,10 @@ fn check_fn_inner<'tcx>( } let mut bounds_lts = Vec::new(); - let types = generics.params.iter().filter(|param| match param.kind { - GenericParamKind::Type { .. } => true, - _ => false, - }); + let types = generics + .params + .iter() + .filter(|param| matches!(param.kind, GenericParamKind::Type { .. })); for typ in types { for bound in typ.bounds { let mut visitor = RefVisitor::new(cx); @@ -337,10 +337,10 @@ impl<'a, 'tcx> RefVisitor<'a, 'tcx> { fn collect_anonymous_lifetimes(&mut self, qpath: &QPath<'_>, ty: &Ty<'_>) { if let Some(ref last_path_segment) = last_path_segment(qpath).args { if !last_path_segment.parenthesized - && !last_path_segment.args.iter().any(|arg| match arg { - GenericArg::Lifetime(_) => true, - _ => false, - }) + && !last_path_segment + .args + .iter() + .any(|arg| matches!(arg, GenericArg::Lifetime(_))) { let hir_id = ty.hir_id; match self.cx.qpath_res(qpath, hir_id) { diff --git a/src/tools/clippy/clippy_lints/src/literal_representation.rs b/src/tools/clippy/clippy_lints/src/literal_representation.rs index 7ba43562d7d..a36fdca5d5d 100644 --- a/src/tools/clippy/clippy_lints/src/literal_representation.rs +++ b/src/tools/clippy/clippy_lints/src/literal_representation.rs @@ -264,10 +264,13 @@ impl LiteralDigitGrouping { let (part, mistyped_suffixes, missing_char) = if let Some((_, exponent)) = &mut num_lit.exponent { (exponent, &["32", "64"][..], 'f') - } else if let Some(fraction) = &mut num_lit.fraction { - (fraction, &["32", "64"][..], 'f') } else { - (&mut num_lit.integer, &["8", "16", "32", "64"][..], 'i') + num_lit + .fraction + .as_mut() + .map_or((&mut num_lit.integer, &["8", "16", "32", "64"][..], 'i'), |fraction| { + (fraction, &["32", "64"][..], 'f') + }) }; let mut split = part.rsplit('_'); diff --git a/src/tools/clippy/clippy_lints/src/loops.rs b/src/tools/clippy/clippy_lints/src/loops.rs index d821b513484..396bb659109 100644 --- a/src/tools/clippy/clippy_lints/src/loops.rs +++ b/src/tools/clippy/clippy_lints/src/loops.rs @@ -686,13 +686,9 @@ fn never_loop_expr(expr: &Expr<'_>, main_loop_id: HirId) -> NeverLoopResult { NeverLoopResult::AlwaysBreak } }, - ExprKind::Break(_, ref e) | ExprKind::Ret(ref e) => { - if let Some(ref e) = *e { - combine_seq(never_loop_expr(e, main_loop_id), NeverLoopResult::AlwaysBreak) - } else { - NeverLoopResult::AlwaysBreak - } - }, + ExprKind::Break(_, ref e) | ExprKind::Ret(ref e) => e.as_ref().map_or(NeverLoopResult::AlwaysBreak, |e| { + combine_seq(never_loop_expr(e, main_loop_id), NeverLoopResult::AlwaysBreak) + }), ExprKind::InlineAsm(ref asm) => asm .operands .iter() @@ -1881,13 +1877,9 @@ fn is_ref_iterable_type(cx: &LateContext<'_>, e: &Expr<'_>) -> bool { fn is_iterable_array<'tcx>(ty: Ty<'tcx>, cx: &LateContext<'tcx>) -> bool { // IntoIterator is currently only implemented for array sizes <= 32 in rustc match ty.kind { - ty::Array(_, n) => { - if let Some(val) = n.try_eval_usize(cx.tcx, cx.param_env) { - (0..=32).contains(&val) - } else { - false - } - }, + ty::Array(_, n) => n + .try_eval_usize(cx.tcx, cx.param_env) + .map_or(false, |val| (0..=32).contains(&val)), _ => false, } } @@ -1899,11 +1891,7 @@ fn extract_expr_from_first_stmt<'tcx>(block: &Block<'tcx>) -> Option<&'tcx Expr< return None; } if let StmtKind::Local(ref local) = block.stmts[0].kind { - if let Some(expr) = local.init { - Some(expr) - } else { - None - } + local.init //.map(|expr| expr) } else { None } @@ -2023,15 +2011,13 @@ impl<'a, 'tcx> Visitor<'tcx> for InitializeVisitor<'a, 'tcx> { if let PatKind::Binding(.., ident, _) = local.pat.kind { self.name = Some(ident.name); - self.state = if let Some(ref init) = local.init { + self.state = local.init.as_ref().map_or(VarState::Declared, |init| { if is_integer_const(&self.cx, init, 0) { VarState::Warn } else { VarState::Declared } - } else { - VarState::Declared - } + }) } } } @@ -2105,17 +2091,11 @@ fn var_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<HirId> { } fn is_loop(expr: &Expr<'_>) -> bool { - match expr.kind { - ExprKind::Loop(..) => true, - _ => false, - } + matches!(expr.kind, ExprKind::Loop(..)) } fn is_conditional(expr: &Expr<'_>) -> bool { - match expr.kind { - ExprKind::Match(..) => true, - _ => false, - } + matches!(expr.kind, ExprKind::Match(..)) } fn is_nested(cx: &LateContext<'_>, match_expr: &Expr<'_>, iter_expr: &Expr<'_>) -> bool { diff --git a/src/tools/clippy/clippy_lints/src/map_identity.rs b/src/tools/clippy/clippy_lints/src/map_identity.rs new file mode 100644 index 00000000000..24ec78c8846 --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/map_identity.rs @@ -0,0 +1,126 @@ +use crate::utils::{ + is_adjusted, is_type_diagnostic_item, match_path, match_trait_method, match_var, paths, remove_blocks, + span_lint_and_sugg, +}; +use if_chain::if_chain; +use rustc_errors::Applicability; +use rustc_hir::{Body, Expr, ExprKind, Pat, PatKind, QPath, StmtKind}; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; + +declare_clippy_lint! { + /// **What it does:** Checks for instances of `map(f)` where `f` is the identity function. + /// + /// **Why is this bad?** It can be written more concisely without the call to `map`. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// let x = [1, 2, 3]; + /// let y: Vec<_> = x.iter().map(|x| x).map(|x| 2*x).collect(); + /// ``` + /// Use instead: + /// ```rust + /// let x = [1, 2, 3]; + /// let y: Vec<_> = x.iter().map(|x| 2*x).collect(); + /// ``` + pub MAP_IDENTITY, + complexity, + "using iterator.map(|x| x)" +} + +declare_lint_pass!(MapIdentity => [MAP_IDENTITY]); + +impl<'tcx> LateLintPass<'tcx> for MapIdentity { + fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) { + if expr.span.from_expansion() { + return; + } + + if_chain! { + if let Some([caller, func]) = get_map_argument(cx, expr); + if is_expr_identity_function(cx, func); + then { + span_lint_and_sugg( + cx, + MAP_IDENTITY, + expr.span.trim_start(caller.span).unwrap(), + "unnecessary map of the identity function", + "remove the call to `map`", + String::new(), + Applicability::MachineApplicable + ) + } + } + } +} + +/// Returns the arguments passed into map() if the expression is a method call to +/// map(). Otherwise, returns None. +fn get_map_argument<'a>(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<&'a [Expr<'a>]> { + if_chain! { + if let ExprKind::MethodCall(ref method, _, ref args, _) = expr.kind; + if args.len() == 2 && method.ident.as_str() == "map"; + let caller_ty = cx.tables().expr_ty(&args[0]); + if match_trait_method(cx, expr, &paths::ITERATOR) + || is_type_diagnostic_item(cx, caller_ty, sym!(result_type)) + || is_type_diagnostic_item(cx, caller_ty, sym!(option_type)); + then { + Some(args) + } else { + None + } + } +} + +/// Checks if an expression represents the identity function +/// Only examines closures and `std::convert::identity` +fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { + match expr.kind { + ExprKind::Closure(_, _, body_id, _, _) => is_body_identity_function(cx, cx.tcx.hir().body(body_id)), + ExprKind::Path(QPath::Resolved(_, ref path)) => match_path(path, &paths::STD_CONVERT_IDENTITY), + _ => false, + } +} + +/// Checks if a function's body represents the identity function +/// Looks for bodies of the form `|x| x`, `|x| return x`, `|x| { return x }` or `|x| { +/// return x; }` +fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool { + let params = func.params; + let body = remove_blocks(&func.value); + + // if there's less/more than one parameter, then it is not the identity function + if params.len() != 1 { + return false; + } + + match body.kind { + ExprKind::Path(QPath::Resolved(None, _)) => match_expr_param(cx, body, params[0].pat), + ExprKind::Ret(Some(ref ret_val)) => match_expr_param(cx, ret_val, params[0].pat), + ExprKind::Block(ref block, _) => { + if_chain! { + if block.stmts.len() == 1; + if let StmtKind::Semi(ref expr) | StmtKind::Expr(ref expr) = block.stmts[0].kind; + if let ExprKind::Ret(Some(ref ret_val)) = expr.kind; + then { + match_expr_param(cx, ret_val, params[0].pat) + } else { + false + } + } + }, + _ => false, + } +} + +/// Returns true iff an expression returns the same thing as a parameter's pattern +fn match_expr_param(cx: &LateContext<'_>, expr: &Expr<'_>, pat: &Pat<'_>) -> bool { + if let PatKind::Binding(_, _, ident, _) = pat.kind { + match_var(expr, ident.name) && !(cx.tables().hir_owner == expr.hir_id.owner && is_adjusted(cx, expr)) + } else { + false + } +} diff --git a/src/tools/clippy/clippy_lints/src/matches.rs b/src/tools/clippy/clippy_lints/src/matches.rs index b754a45aa40..bd474c20807 100644 --- a/src/tools/clippy/clippy_lints/src/matches.rs +++ b/src/tools/clippy/clippy_lints/src/matches.rs @@ -13,14 +13,14 @@ use rustc_ast::ast::LitKind; use rustc_errors::Applicability; use rustc_hir::def::CtorKind; use rustc_hir::{ - Arm, BindingAnnotation, Block, BorrowKind, Expr, ExprKind, Local, MatchSource, Mutability, Node, Pat, PatKind, - QPath, RangeEnd, + Arm, BindingAnnotation, Block, BorrowKind, Expr, ExprKind, Guard, Local, MatchSource, Mutability, Node, Pat, + PatKind, QPath, RangeEnd, }; use rustc_lint::{LateContext, LateLintPass, LintContext}; use rustc_middle::lint::in_external_macro; use rustc_middle::ty::{self, Ty}; use rustc_session::{declare_tool_lint, impl_lint_pass}; -use rustc_span::source_map::Span; +use rustc_span::source_map::{Span, Spanned}; use std::cmp::Ordering; use std::collections::Bound; @@ -409,6 +409,74 @@ declare_clippy_lint! { "a match on a struct that binds all fields but still uses the wildcard pattern" } +declare_clippy_lint! { + /// **What it does:** Lint for redundant pattern matching over `Result` or + /// `Option` + /// + /// **Why is this bad?** It's more concise and clear to just use the proper + /// utility function + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// if let Ok(_) = Ok::<i32, i32>(42) {} + /// if let Err(_) = Err::<i32, i32>(42) {} + /// if let None = None::<()> {} + /// if let Some(_) = Some(42) {} + /// match Ok::<i32, i32>(42) { + /// Ok(_) => true, + /// Err(_) => false, + /// }; + /// ``` + /// + /// The more idiomatic use would be: + /// + /// ```rust + /// if Ok::<i32, i32>(42).is_ok() {} + /// if Err::<i32, i32>(42).is_err() {} + /// if None::<()>.is_none() {} + /// if Some(42).is_some() {} + /// Ok::<i32, i32>(42).is_ok(); + /// ``` + pub REDUNDANT_PATTERN_MATCHING, + style, + "use the proper utility function avoiding an `if let`" +} + +declare_clippy_lint! { + /// **What it does:** Checks for `match` or `if let` expressions producing a + /// `bool` that could be written using `matches!` + /// + /// **Why is this bad?** Readability and needless complexity. + /// + /// **Known problems:** None + /// + /// **Example:** + /// ```rust + /// let x = Some(5); + /// + /// // Bad + /// let a = match x { + /// Some(0) => true, + /// _ => false, + /// }; + /// + /// let a = if let Some(0) = x { + /// true + /// } else { + /// false + /// }; + /// + /// // Good + /// let a = matches!(x, Some(0)); + /// ``` + pub MATCH_LIKE_MATCHES_MACRO, + style, + "a match that could be written with the matches! macro" +} + #[derive(Default)] pub struct Matches { infallible_destructuring_match_linted: bool, @@ -427,7 +495,9 @@ impl_lint_pass!(Matches => [ WILDCARD_IN_OR_PATTERNS, MATCH_SINGLE_BINDING, INFALLIBLE_DESTRUCTURING_MATCH, - REST_PAT_IN_FULLY_BOUND_STRUCTS + REST_PAT_IN_FULLY_BOUND_STRUCTS, + REDUNDANT_PATTERN_MATCHING, + MATCH_LIKE_MATCHES_MACRO ]); impl<'tcx> LateLintPass<'tcx> for Matches { @@ -435,6 +505,10 @@ impl<'tcx> LateLintPass<'tcx> for Matches { if in_external_macro(cx.sess(), expr.span) { return; } + + redundant_pattern_match::check(cx, expr); + check_match_like_matches(cx, expr); + if let ExprKind::Match(ref ex, ref arms, MatchSource::Normal) = expr.kind { check_single_match(cx, ex, arms, expr); check_match_bool(cx, ex, arms, expr); @@ -530,16 +604,22 @@ fn check_single_match(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], exp // the lint noisy in unnecessary situations return; } - let els = remove_blocks(&arms[1].body); - let els = if is_unit_expr(els) { + let els = arms[1].body; + let els = if is_unit_expr(remove_blocks(els)) { None - } else if let ExprKind::Block(_, _) = els.kind { - // matches with blocks that contain statements are prettier as `if let + else` - Some(els) + } else if let ExprKind::Block(Block { stmts, expr: block_expr, .. }, _) = els.kind { + if stmts.len() == 1 && block_expr.is_none() || stmts.is_empty() && block_expr.is_some() { + // single statement/expr "else" block, don't lint + return; + } else { + // block with 2+ statements or 1 expr and 1+ statement + Some(els) + } } else { - // allow match arms with just expressions - return; + // not a block, don't lint + return; }; + let ty = cx.tables().expr_ty(ex); if ty.kind != ty::Bool || is_allowed(cx, MATCH_BOOL, ex.hir_id) { check_single_match_single_pattern(cx, ex, arms, expr, els); @@ -802,13 +882,8 @@ fn check_wild_enum_match(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>]) // Some simple checks for exhaustive patterns. // There is a room for improvements to detect more cases, // but it can be more expensive to do so. - let is_pattern_exhaustive = |pat: &&Pat<'_>| { - if let PatKind::Wild | PatKind::Binding(.., None) = pat.kind { - true - } else { - false - } - }; + let is_pattern_exhaustive = + |pat: &&Pat<'_>| matches!(pat.kind, PatKind::Wild | PatKind::Binding(.., None)); if patterns.iter().all(is_pattern_exhaustive) { missing_variants.retain(|e| e.ctor_def_id != Some(p.res.def_id())); } @@ -989,6 +1064,79 @@ fn check_wild_in_or_pats(cx: &LateContext<'_>, arms: &[Arm<'_>]) { } } +/// Lint a `match` or `if let .. { .. } else { .. }` expr that could be replaced by `matches!` +fn check_match_like_matches<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) { + if let ExprKind::Match(ex, arms, ref match_source) = &expr.kind { + match match_source { + MatchSource::Normal => find_matches_sugg(cx, ex, arms, expr, false), + MatchSource::IfLetDesugar { .. } => find_matches_sugg(cx, ex, arms, expr, true), + _ => return, + } + } +} + +/// Lint a `match` or desugared `if let` for replacement by `matches!` +fn find_matches_sugg(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>, desugared: bool) { + if_chain! { + if arms.len() == 2; + if cx.tables().expr_ty(expr).is_bool(); + if is_wild(&arms[1].pat); + if let Some(first) = find_bool_lit(&arms[0].body.kind, desugared); + if let Some(second) = find_bool_lit(&arms[1].body.kind, desugared); + if first != second; + then { + let mut applicability = Applicability::MachineApplicable; + + let pat_and_guard = if let Some(Guard::If(g)) = arms[0].guard { + format!("{} if {}", snippet_with_applicability(cx, arms[0].pat.span, "..", &mut applicability), snippet_with_applicability(cx, g.span, "..", &mut applicability)) + } else { + format!("{}", snippet_with_applicability(cx, arms[0].pat.span, "..", &mut applicability)) + }; + span_lint_and_sugg( + cx, + MATCH_LIKE_MATCHES_MACRO, + expr.span, + &format!("{} expression looks like `matches!` macro", if desugared { "if let .. else" } else { "match" }), + "try this", + format!( + "{}matches!({}, {})", + if first { "" } else { "!" }, + snippet_with_applicability(cx, ex.span, "..", &mut applicability), + pat_and_guard, + ), + applicability, + ) + } + } +} + +/// Extract a `bool` or `{ bool }` +fn find_bool_lit(ex: &ExprKind<'_>, desugared: bool) -> Option<bool> { + match ex { + ExprKind::Lit(Spanned { + node: LitKind::Bool(b), .. + }) => Some(*b), + ExprKind::Block( + rustc_hir::Block { + stmts: &[], + expr: Some(exp), + .. + }, + _, + ) if desugared => { + if let ExprKind::Lit(Spanned { + node: LitKind::Bool(b), .. + }) = exp.kind + { + Some(b) + } else { + None + } + }, + _ => None, + } +} + fn check_match_single_binding<'a>(cx: &LateContext<'a>, ex: &Expr<'a>, arms: &[Arm<'_>], expr: &Expr<'_>) { if in_macro(expr.span) || arms.len() != 1 || is_refutable(cx, arms[0].pat) { return; @@ -1179,10 +1327,7 @@ fn is_unit_expr(expr: &Expr<'_>) -> bool { // Checks if arm has the form `None => None` fn is_none_arm(arm: &Arm<'_>) -> bool { - match arm.pat.kind { - PatKind::Path(ref path) if match_qpath(path, &paths::OPTION_NONE) => true, - _ => false, - } + matches!(arm.pat.kind, PatKind::Path(ref path) if match_qpath(path, &paths::OPTION_NONE)) } // Checks if arm has the form `Some(ref v) => Some(v)` (checks for `ref` and `ref mut`) @@ -1293,6 +1438,229 @@ where None } +mod redundant_pattern_match { + use super::REDUNDANT_PATTERN_MATCHING; + use crate::utils::{in_constant, match_qpath, match_trait_method, paths, snippet, span_lint_and_then}; + use if_chain::if_chain; + use rustc_ast::ast::LitKind; + use rustc_errors::Applicability; + use rustc_hir::{Arm, Expr, ExprKind, HirId, MatchSource, PatKind, QPath}; + use rustc_lint::LateContext; + use rustc_middle::ty; + use rustc_mir::const_eval::is_const_fn; + use rustc_span::source_map::Symbol; + + pub fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) { + if let ExprKind::Match(op, arms, ref match_source) = &expr.kind { + match match_source { + MatchSource::Normal => find_sugg_for_match(cx, expr, op, arms), + MatchSource::IfLetDesugar { .. } => find_sugg_for_if_let(cx, expr, op, arms, "if"), + MatchSource::WhileLetDesugar => find_sugg_for_if_let(cx, expr, op, arms, "while"), + _ => {}, + } + } + } + + fn find_sugg_for_if_let<'tcx>( + cx: &LateContext<'tcx>, + expr: &'tcx Expr<'_>, + op: &Expr<'_>, + arms: &[Arm<'_>], + keyword: &'static str, + ) { + fn find_suggestion(cx: &LateContext<'_>, hir_id: HirId, path: &QPath<'_>) -> Option<&'static str> { + if match_qpath(path, &paths::RESULT_OK) && can_suggest(cx, hir_id, sym!(result_type), "is_ok") { + return Some("is_ok()"); + } + if match_qpath(path, &paths::RESULT_ERR) && can_suggest(cx, hir_id, sym!(result_type), "is_err") { + return Some("is_err()"); + } + if match_qpath(path, &paths::OPTION_SOME) && can_suggest(cx, hir_id, sym!(option_type), "is_some") { + return Some("is_some()"); + } + if match_qpath(path, &paths::OPTION_NONE) && can_suggest(cx, hir_id, sym!(option_type), "is_none") { + return Some("is_none()"); + } + None + } + + let hir_id = expr.hir_id; + let good_method = match arms[0].pat.kind { + PatKind::TupleStruct(ref path, ref patterns, _) if patterns.len() == 1 => { + if let PatKind::Wild = patterns[0].kind { + find_suggestion(cx, hir_id, path) + } else { + None + } + }, + PatKind::Path(ref path) => find_suggestion(cx, hir_id, path), + _ => None, + }; + let good_method = match good_method { + Some(method) => method, + None => return, + }; + + // check that `while_let_on_iterator` lint does not trigger + if_chain! { + if keyword == "while"; + if let ExprKind::MethodCall(method_path, _, _, _) = op.kind; + if method_path.ident.name == sym!(next); + if match_trait_method(cx, op, &paths::ITERATOR); + then { + return; + } + } + + span_lint_and_then( + cx, + REDUNDANT_PATTERN_MATCHING, + arms[0].pat.span, + &format!("redundant pattern matching, consider using `{}`", good_method), + |diag| { + // while let ... = ... { ... } + // ^^^^^^^^^^^^^^^^^^^^^^^^^^^ + let expr_span = expr.span; + + // while let ... = ... { ... } + // ^^^ + let op_span = op.span.source_callsite(); + + // while let ... = ... { ... } + // ^^^^^^^^^^^^^^^^^^^ + let span = expr_span.until(op_span.shrink_to_hi()); + diag.span_suggestion( + span, + "try this", + format!("{} {}.{}", keyword, snippet(cx, op_span, "_"), good_method), + Applicability::MachineApplicable, // snippet + ); + }, + ); + } + + fn find_sugg_for_match<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, op: &Expr<'_>, arms: &[Arm<'_>]) { + if arms.len() == 2 { + let node_pair = (&arms[0].pat.kind, &arms[1].pat.kind); + + let hir_id = expr.hir_id; + let found_good_method = match node_pair { + ( + PatKind::TupleStruct(ref path_left, ref patterns_left, _), + PatKind::TupleStruct(ref path_right, ref patterns_right, _), + ) if patterns_left.len() == 1 && patterns_right.len() == 1 => { + if let (PatKind::Wild, PatKind::Wild) = (&patterns_left[0].kind, &patterns_right[0].kind) { + find_good_method_for_match( + arms, + path_left, + path_right, + &paths::RESULT_OK, + &paths::RESULT_ERR, + "is_ok()", + "is_err()", + || can_suggest(cx, hir_id, sym!(result_type), "is_ok"), + || can_suggest(cx, hir_id, sym!(result_type), "is_err"), + ) + } else { + None + } + }, + (PatKind::TupleStruct(ref path_left, ref patterns, _), PatKind::Path(ref path_right)) + | (PatKind::Path(ref path_left), PatKind::TupleStruct(ref path_right, ref patterns, _)) + if patterns.len() == 1 => + { + if let PatKind::Wild = patterns[0].kind { + find_good_method_for_match( + arms, + path_left, + path_right, + &paths::OPTION_SOME, + &paths::OPTION_NONE, + "is_some()", + "is_none()", + || can_suggest(cx, hir_id, sym!(option_type), "is_some"), + || can_suggest(cx, hir_id, sym!(option_type), "is_none"), + ) + } else { + None + } + }, + _ => None, + }; + + if let Some(good_method) = found_good_method { + span_lint_and_then( + cx, + REDUNDANT_PATTERN_MATCHING, + expr.span, + &format!("redundant pattern matching, consider using `{}`", good_method), + |diag| { + let span = expr.span.to(op.span); + diag.span_suggestion( + span, + "try this", + format!("{}.{}", snippet(cx, op.span, "_"), good_method), + Applicability::MaybeIncorrect, // snippet + ); + }, + ); + } + } + } + + #[allow(clippy::too_many_arguments)] + fn find_good_method_for_match<'a>( + arms: &[Arm<'_>], + path_left: &QPath<'_>, + path_right: &QPath<'_>, + expected_left: &[&str], + expected_right: &[&str], + should_be_left: &'a str, + should_be_right: &'a str, + can_suggest_left: impl Fn() -> bool, + can_suggest_right: impl Fn() -> bool, + ) -> Option<&'a str> { + let body_node_pair = if match_qpath(path_left, expected_left) && match_qpath(path_right, expected_right) { + (&(*arms[0].body).kind, &(*arms[1].body).kind) + } else if match_qpath(path_right, expected_left) && match_qpath(path_left, expected_right) { + (&(*arms[1].body).kind, &(*arms[0].body).kind) + } else { + return None; + }; + + match body_node_pair { + (ExprKind::Lit(ref lit_left), ExprKind::Lit(ref lit_right)) => match (&lit_left.node, &lit_right.node) { + (LitKind::Bool(true), LitKind::Bool(false)) if can_suggest_left() => Some(should_be_left), + (LitKind::Bool(false), LitKind::Bool(true)) if can_suggest_right() => Some(should_be_right), + _ => None, + }, + _ => None, + } + } + + fn can_suggest(cx: &LateContext<'_>, hir_id: HirId, diag_item: Symbol, name: &str) -> bool { + if !in_constant(cx, hir_id) { + return true; + } + + // Avoid suggesting calls to non-`const fn`s in const contexts, see #5697. + cx.tcx + .get_diagnostic_item(diag_item) + .and_then(|def_id| { + cx.tcx.inherent_impls(def_id).iter().find_map(|imp| { + cx.tcx + .associated_items(*imp) + .in_definition_order() + .find_map(|item| match item.kind { + ty::AssocKind::Fn if item.ident.name.as_str() == name => Some(item.def_id), + _ => None, + }) + }) + }) + .map_or(false, |def_id| is_const_fn(cx.tcx, def_id)) + } +} + #[test] fn test_overlapping() { use rustc_span::source_map::DUMMY_SP; diff --git a/src/tools/clippy/clippy_lints/src/methods/mod.rs b/src/tools/clippy/clippy_lints/src/methods/mod.rs index 216db12f011..4c595029ff7 100644 --- a/src/tools/clippy/clippy_lints/src/methods/mod.rs +++ b/src/tools/clippy/clippy_lints/src/methods/mod.rs @@ -1844,10 +1844,10 @@ fn lint_expect_fun_call( ty::Ref(ty::ReStatic, ..) ) }), - hir::ExprKind::Path(ref p) => match cx.qpath_res(p, arg.hir_id) { - hir::def::Res::Def(hir::def::DefKind::Const | hir::def::DefKind::Static, _) => true, - _ => false, - }, + hir::ExprKind::Path(ref p) => matches!( + cx.qpath_res(p, arg.hir_id), + hir::def::Res::Def(hir::def::DefKind::Const | hir::def::DefKind::Static, _) + ), _ => false, } } @@ -2028,13 +2028,7 @@ fn lint_clone_on_copy(cx: &LateContext<'_>, expr: &hir::Expr<'_>, arg: &hir::Exp .tables() .expr_adjustments(arg) .iter() - .filter(|adj| { - if let ty::adjustment::Adjust::Deref(_) = adj.kind { - true - } else { - false - } - }) + .filter(|adj| matches!(adj.kind, ty::adjustment::Adjust::Deref(_))) .count(); let derefs: String = iter::repeat('*').take(deref_count).collect(); snip = Some(("try dereferencing it", format!("{}{}", derefs, snippet))); @@ -2044,7 +2038,7 @@ fn lint_clone_on_copy(cx: &LateContext<'_>, expr: &hir::Expr<'_>, arg: &hir::Exp } span_lint_and_then(cx, CLONE_ON_COPY, expr.span, "using `clone` on a `Copy` type", |diag| { if let Some((text, snip)) = snip { - diag.span_suggestion(expr.span, text, snip, Applicability::Unspecified); + diag.span_suggestion(expr.span, text, snip, Applicability::MachineApplicable); } }); } @@ -2460,13 +2454,9 @@ fn derefs_to_slice<'tcx>( ty::Slice(_) => true, ty::Adt(def, _) if def.is_box() => may_slice(cx, ty.boxed_ty()), ty::Adt(..) => is_type_diagnostic_item(cx, ty, sym!(vec_type)), - ty::Array(_, size) => { - if let Some(size) = size.try_eval_usize(cx.tcx, cx.param_env) { - size < 32 - } else { - false - } - }, + ty::Array(_, size) => size + .try_eval_usize(cx.tcx, cx.param_env) + .map_or(false, |size| size < 32), ty::Ref(_, inner, _) => may_slice(cx, inner), _ => false, } diff --git a/src/tools/clippy/clippy_lints/src/methods/unnecessary_filter_map.rs b/src/tools/clippy/clippy_lints/src/methods/unnecessary_filter_map.rs index fdcba110542..75e123eb593 100644 --- a/src/tools/clippy/clippy_lints/src/methods/unnecessary_filter_map.rs +++ b/src/tools/clippy/clippy_lints/src/methods/unnecessary_filter_map.rs @@ -77,13 +77,10 @@ fn check_expression<'tcx>(cx: &LateContext<'tcx>, arg_id: hir::HirId, expr: &'tc } (true, true) }, - hir::ExprKind::Block(ref block, _) => { - if let Some(expr) = &block.expr { - check_expression(cx, arg_id, &expr) - } else { - (false, false) - } - }, + hir::ExprKind::Block(ref block, _) => block + .expr + .as_ref() + .map_or((false, false), |expr| check_expression(cx, arg_id, &expr)), hir::ExprKind::Match(_, arms, _) => { let mut found_mapping = false; let mut found_filtering = false; diff --git a/src/tools/clippy/clippy_lints/src/minmax.rs b/src/tools/clippy/clippy_lints/src/minmax.rs index 0a2d577396a..c8aa98d3489 100644 --- a/src/tools/clippy/clippy_lints/src/minmax.rs +++ b/src/tools/clippy/clippy_lints/src/minmax.rs @@ -53,7 +53,7 @@ impl<'tcx> LateLintPass<'tcx> for MinMaxPass { } } -#[derive(PartialEq, Eq, Debug)] +#[derive(PartialEq, Eq, Debug, Clone, Copy)] enum MinMax { Min, Max, @@ -86,16 +86,15 @@ fn fetch_const<'a>(cx: &LateContext<'_>, args: &'a [Expr<'a>], m: MinMax) -> Opt if args.len() != 2 { return None; } - if let Some(c) = constant_simple(cx, cx.tables(), &args[0]) { - if constant_simple(cx, cx.tables(), &args[1]).is_none() { - // otherwise ignore - Some((m, c, &args[1])) - } else { - None - } - } else if let Some(c) = constant_simple(cx, cx.tables(), &args[1]) { - Some((m, c, &args[0])) - } else { - None - } + constant_simple(cx, cx.tables(), &args[0]).map_or_else( + || constant_simple(cx, cx.tables(), &args[1]).map(|c| (m, c, &args[0])), + |c| { + if constant_simple(cx, cx.tables(), &args[1]).is_none() { + // otherwise ignore + Some((m, c, &args[1])) + } else { + None + } + }, + ) } diff --git a/src/tools/clippy/clippy_lints/src/misc.rs b/src/tools/clippy/clippy_lints/src/misc.rs index d7e1a62a19d..400f4b609af 100644 --- a/src/tools/clippy/clippy_lints/src/misc.rs +++ b/src/tools/clippy/clippy_lints/src/misc.rs @@ -3,11 +3,11 @@ use rustc_ast::ast::LitKind; use rustc_errors::Applicability; use rustc_hir::intravisit::FnKind; use rustc_hir::{ - def, BinOpKind, BindingAnnotation, Body, Expr, ExprKind, FnDecl, HirId, Mutability, PatKind, Stmt, StmtKind, Ty, - TyKind, UnOp, + self as hir, def, BinOpKind, BindingAnnotation, Body, Expr, ExprKind, FnDecl, HirId, Mutability, PatKind, Stmt, + StmtKind, TyKind, UnOp, }; use rustc_lint::{LateContext, LateLintPass}; -use rustc_middle::ty; +use rustc_middle::ty::{self, Ty}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::hygiene::DesugaringKind; use rustc_span::source_map::{ExpnKind, Span}; @@ -371,8 +371,8 @@ impl<'tcx> LateLintPass<'tcx> for MiscLints { if op.is_comparison() { check_nan(cx, left, expr); check_nan(cx, right, expr); - check_to_owned(cx, left, right); - check_to_owned(cx, right, left); + check_to_owned(cx, left, right, true); + check_to_owned(cx, right, left, false); } if (op == BinOpKind::Eq || op == BinOpKind::Ne) && (is_float(cx, left) || is_float(cx, right)) { if is_allowed(cx, left) || is_allowed(cx, right) { @@ -570,11 +570,30 @@ fn is_array(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { matches!(&walk_ptrs_ty(cx.tables().expr_ty(expr)).kind, ty::Array(_, _)) } -fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>) { +fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>, left: bool) { + #[derive(Default)] + struct EqImpl { + ty_eq_other: bool, + other_eq_ty: bool, + } + + impl EqImpl { + fn is_implemented(&self) -> bool { + self.ty_eq_other || self.other_eq_ty + } + } + + fn symmetric_partial_eq<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, other: Ty<'tcx>) -> Option<EqImpl> { + cx.tcx.lang_items().eq_trait().map(|def_id| EqImpl { + ty_eq_other: implements_trait(cx, ty, def_id, &[other.into()]), + other_eq_ty: implements_trait(cx, other, def_id, &[ty.into()]), + }) + } + let (arg_ty, snip) = match expr.kind { ExprKind::MethodCall(.., ref args, _) if args.len() == 1 => { if match_trait_method(cx, expr, &paths::TO_STRING) || match_trait_method(cx, expr, &paths::TO_OWNED) { - (cx.tables().expr_ty_adjusted(&args[0]), snippet(cx, args[0].span, "..")) + (cx.tables().expr_ty(&args[0]), snippet(cx, args[0].span, "..")) } else { return; } @@ -582,7 +601,7 @@ fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>) { ExprKind::Call(ref path, ref v) if v.len() == 1 => { if let ExprKind::Path(ref path) = path.kind { if match_qpath(path, &["String", "from_str"]) || match_qpath(path, &["String", "from"]) { - (cx.tables().expr_ty_adjusted(&v[0]), snippet(cx, v[0].span, "..")) + (cx.tables().expr_ty(&v[0]), snippet(cx, v[0].span, "..")) } else { return; } @@ -593,28 +612,19 @@ fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>) { _ => return, }; - let other_ty = cx.tables().expr_ty_adjusted(other); - let partial_eq_trait_id = match cx.tcx.lang_items().eq_trait() { - Some(id) => id, - None => return, - }; + let other_ty = cx.tables().expr_ty(other); - let deref_arg_impl_partial_eq_other = arg_ty.builtin_deref(true).map_or(false, |tam| { - implements_trait(cx, tam.ty, partial_eq_trait_id, &[other_ty.into()]) - }); - let arg_impl_partial_eq_deref_other = other_ty.builtin_deref(true).map_or(false, |tam| { - implements_trait(cx, arg_ty, partial_eq_trait_id, &[tam.ty.into()]) - }); - let arg_impl_partial_eq_other = implements_trait(cx, arg_ty, partial_eq_trait_id, &[other_ty.into()]); + let without_deref = symmetric_partial_eq(cx, arg_ty, other_ty).unwrap_or_default(); + let with_deref = arg_ty + .builtin_deref(true) + .and_then(|tam| symmetric_partial_eq(cx, tam.ty, other_ty)) + .unwrap_or_default(); - if !deref_arg_impl_partial_eq_other && !arg_impl_partial_eq_deref_other && !arg_impl_partial_eq_other { + if !with_deref.is_implemented() && !without_deref.is_implemented() { return; } - let other_gets_derefed = match other.kind { - ExprKind::Unary(UnOp::UnDeref, _) => true, - _ => false, - }; + let other_gets_derefed = matches!(other.kind, ExprKind::Unary(UnOp::UnDeref, _)); let lint_span = if other_gets_derefed { expr.span.to(other.span) @@ -634,18 +644,34 @@ fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>) { return; } - let try_hint = if deref_arg_impl_partial_eq_other { - // suggest deref on the left - format!("*{}", snip) + let expr_snip; + let eq_impl; + if with_deref.is_implemented() { + expr_snip = format!("*{}", snip); + eq_impl = with_deref; } else { - // suggest dropping the to_owned on the left - snip.to_string() + expr_snip = snip.to_string(); + eq_impl = without_deref; }; + let span; + let hint; + if (eq_impl.ty_eq_other && left) || (eq_impl.other_eq_ty && !left) { + span = expr.span; + hint = expr_snip; + } else { + span = expr.span.to(other.span); + if eq_impl.ty_eq_other { + hint = format!("{} == {}", expr_snip, snippet(cx, other.span, "..")); + } else { + hint = format!("{} == {}", snippet(cx, other.span, ".."), expr_snip); + } + } + diag.span_suggestion( - lint_span, + span, "try", - try_hint, + hint, Applicability::MachineApplicable, // snippet ); }, @@ -656,16 +682,10 @@ fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>) { /// `unused_variables`'s idea /// of what it means for an expression to be "used". fn is_used(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { - if let Some(parent) = get_parent_expr(cx, expr) { - match parent.kind { - ExprKind::Assign(_, ref rhs, _) | ExprKind::AssignOp(_, _, ref rhs) => { - SpanlessEq::new(cx).eq_expr(rhs, expr) - }, - _ => is_used(cx, parent), - } - } else { - true - } + get_parent_expr(cx, expr).map_or(true, |parent| match parent.kind { + ExprKind::Assign(_, ref rhs, _) | ExprKind::AssignOp(_, _, ref rhs) => SpanlessEq::new(cx).eq_expr(rhs, expr), + _ => is_used(cx, parent), + }) } /// Tests whether an expression is in a macro expansion (e.g., something @@ -674,12 +694,7 @@ fn in_attributes_expansion(expr: &Expr<'_>) -> bool { use rustc_span::hygiene::MacroKind; if expr.span.from_expansion() { let data = expr.span.ctxt().outer_expn_data(); - - if let ExpnKind::Macro(MacroKind::Attr, _) = data.kind { - true - } else { - false - } + matches!(data.kind, ExpnKind::Macro(MacroKind::Attr, _)) } else { false } @@ -694,7 +709,7 @@ fn non_macro_local(cx: &LateContext<'_>, res: def::Res) -> bool { } } -fn check_cast(cx: &LateContext<'_>, span: Span, e: &Expr<'_>, ty: &Ty<'_>) { +fn check_cast(cx: &LateContext<'_>, span: Span, e: &Expr<'_>, ty: &hir::Ty<'_>) { if_chain! { if let TyKind::Ptr(ref mut_ty) = ty.kind; if let ExprKind::Lit(ref lit) = e.kind; diff --git a/src/tools/clippy/clippy_lints/src/misc_early.rs b/src/tools/clippy/clippy_lints/src/misc_early.rs index ad39e59d067..b84a1a3fe24 100644 --- a/src/tools/clippy/clippy_lints/src/misc_early.rs +++ b/src/tools/clippy/clippy_lints/src/misc_early.rs @@ -641,28 +641,22 @@ fn check_unneeded_wildcard_pattern(cx: &EarlyContext<'_>, pat: &Pat) { ); } - #[allow(clippy::trivially_copy_pass_by_ref)] - fn is_wild<P: std::ops::Deref<Target = Pat>>(pat: &&P) -> bool { - if let PatKind::Wild = pat.kind { - true - } else { - false - } - } - if let Some(rest_index) = patterns.iter().position(|pat| pat.is_rest()) { if let Some((left_index, left_pat)) = patterns[..rest_index] .iter() .rev() - .take_while(is_wild) + .take_while(|pat| matches!(pat.kind, PatKind::Wild)) .enumerate() .last() { span_lint(cx, left_pat.span.until(patterns[rest_index].span), left_index == 0); } - if let Some((right_index, right_pat)) = - patterns[rest_index + 1..].iter().take_while(is_wild).enumerate().last() + if let Some((right_index, right_pat)) = patterns[rest_index + 1..] + .iter() + .take_while(|pat| matches!(pat.kind, PatKind::Wild)) + .enumerate() + .last() { span_lint( cx, diff --git a/src/tools/clippy/clippy_lints/src/missing_inline.rs b/src/tools/clippy/clippy_lints/src/missing_inline.rs index bf80b62afe6..9c962673537 100644 --- a/src/tools/clippy/clippy_lints/src/missing_inline.rs +++ b/src/tools/clippy/clippy_lints/src/missing_inline.rs @@ -71,10 +71,11 @@ fn check_missing_inline_attrs(cx: &LateContext<'_>, attrs: &[ast::Attribute], sp fn is_executable(cx: &LateContext<'_>) -> bool { use rustc_session::config::CrateType; - cx.tcx.sess.crate_types().iter().any(|t: &CrateType| match t { - CrateType::Executable => true, - _ => false, - }) + cx.tcx + .sess + .crate_types() + .iter() + .any(|t: &CrateType| matches!(t, CrateType::Executable)) } declare_lint_pass!(MissingInline => [MISSING_INLINE_IN_PUBLIC_ITEMS]); diff --git a/src/tools/clippy/clippy_lints/src/new_without_default.rs b/src/tools/clippy/clippy_lints/src/new_without_default.rs index 2597f5f6f17..621ebdef2f0 100644 --- a/src/tools/clippy/clippy_lints/src/new_without_default.rs +++ b/src/tools/clippy/clippy_lints/src/new_without_default.rs @@ -80,10 +80,12 @@ impl<'tcx> LateLintPass<'tcx> for NewWithoutDefault { // can't be implemented for unsafe new return; } - if impl_item.generics.params.iter().any(|gen| match gen.kind { - hir::GenericParamKind::Type { .. } => true, - _ => false, - }) { + if impl_item + .generics + .params + .iter() + .any(|gen| matches!(gen.kind, hir::GenericParamKind::Type { .. })) + { // when the result of `new()` depends on a type parameter we should not require // an // impl of `Default` diff --git a/src/tools/clippy/clippy_lints/src/non_copy_const.rs b/src/tools/clippy/clippy_lints/src/non_copy_const.rs index c11a2ff9ee0..a3521c31a6b 100644 --- a/src/tools/clippy/clippy_lints/src/non_copy_const.rs +++ b/src/tools/clippy/clippy_lints/src/non_copy_const.rs @@ -238,10 +238,10 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst { let ty = if needs_check_adjustment { let adjustments = cx.tables().expr_adjustments(dereferenced_expr); - if let Some(i) = adjustments.iter().position(|adj| match adj.kind { - Adjust::Borrow(_) | Adjust::Deref(_) => true, - _ => false, - }) { + if let Some(i) = adjustments + .iter() + .position(|adj| matches!(adj.kind, Adjust::Borrow(_) | Adjust::Deref(_))) + { if i == 0 { cx.tables().expr_ty(dereferenced_expr) } else { diff --git a/src/tools/clippy/clippy_lints/src/option_if_let_else.rs b/src/tools/clippy/clippy_lints/src/option_if_let_else.rs new file mode 100644 index 00000000000..8dbe58763bf --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/option_if_let_else.rs @@ -0,0 +1,267 @@ +use crate::utils; +use crate::utils::sugg::Sugg; +use crate::utils::{match_type, paths, span_lint_and_sugg}; +use if_chain::if_chain; + +use rustc_errors::Applicability; +use rustc_hir::intravisit::{NestedVisitorMap, Visitor}; +use rustc_hir::{Arm, BindingAnnotation, Block, Expr, ExprKind, MatchSource, Mutability, PatKind, UnOp}; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_middle::hir::map::Map; +use rustc_session::{declare_lint_pass, declare_tool_lint}; + +declare_clippy_lint! { + /// **What it does:** + /// Lints usage of `if let Some(v) = ... { y } else { x }` which is more + /// idiomatically done with `Option::map_or` (if the else bit is a simple + /// expression) or `Option::map_or_else` (if the else bit is a longer + /// block). + /// + /// **Why is this bad?** + /// Using the dedicated functions of the Option type is clearer and + /// more concise than an if let expression. + /// + /// **Known problems:** + /// This lint uses whether the block is just an expression or if it has + /// more statements to decide whether to use `Option::map_or` or + /// `Option::map_or_else`. If you have a single expression which calls + /// an expensive function, then it would be more efficient to use + /// `Option::map_or_else`, but this lint would suggest `Option::map_or`. + /// + /// Also, this lint uses a deliberately conservative metric for checking + /// if the inside of either body contains breaks or continues which will + /// cause it to not suggest a fix if either block contains a loop with + /// continues or breaks contained within the loop. + /// + /// **Example:** + /// + /// ```rust + /// # let optional: Option<u32> = Some(0); + /// # fn do_complicated_function() -> u32 { 5 }; + /// let _ = if let Some(foo) = optional { + /// foo + /// } else { + /// 5 + /// }; + /// let _ = if let Some(foo) = optional { + /// foo + /// } else { + /// let y = do_complicated_function(); + /// y*y + /// }; + /// ``` + /// + /// should be + /// + /// ```rust + /// # let optional: Option<u32> = Some(0); + /// # fn do_complicated_function() -> u32 { 5 }; + /// let _ = optional.map_or(5, |foo| foo); + /// let _ = optional.map_or_else(||{ + /// let y = do_complicated_function(); + /// y*y + /// }, |foo| foo); + /// ``` + pub OPTION_IF_LET_ELSE, + pedantic, + "reimplementation of Option::map_or" +} + +declare_lint_pass!(OptionIfLetElse => [OPTION_IF_LET_ELSE]); + +/// Returns true iff the given expression is the result of calling `Result::ok` +fn is_result_ok(cx: &LateContext<'_>, expr: &'_ Expr<'_>) -> bool { + if let ExprKind::MethodCall(ref path, _, &[ref receiver], _) = &expr.kind { + path.ident.name.to_ident_string() == "ok" && match_type(cx, &cx.tables().expr_ty(&receiver), &paths::RESULT) + } else { + false + } +} + +/// A struct containing information about occurences of the +/// `if let Some(..) = .. else` construct that this lint detects. +struct OptionIfLetElseOccurence { + option: String, + method_sugg: String, + some_expr: String, + none_expr: String, + wrap_braces: bool, +} + +struct ReturnBreakContinueMacroVisitor { + seen_return_break_continue: bool, +} +impl ReturnBreakContinueMacroVisitor { + fn new() -> ReturnBreakContinueMacroVisitor { + ReturnBreakContinueMacroVisitor { + seen_return_break_continue: false, + } + } +} +impl<'tcx> Visitor<'tcx> for ReturnBreakContinueMacroVisitor { + type Map = Map<'tcx>; + fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> { + NestedVisitorMap::None + } + + fn visit_expr(&mut self, ex: &'tcx Expr<'tcx>) { + if self.seen_return_break_continue { + // No need to look farther if we've already seen one of them + return; + } + match &ex.kind { + ExprKind::Ret(..) | ExprKind::Break(..) | ExprKind::Continue(..) => { + self.seen_return_break_continue = true; + }, + // Something special could be done here to handle while or for loop + // desugaring, as this will detect a break if there's a while loop + // or a for loop inside the expression. + _ => { + if utils::in_macro(ex.span) { + self.seen_return_break_continue = true; + } else { + rustc_hir::intravisit::walk_expr(self, ex); + } + }, + } + } +} + +fn contains_return_break_continue_macro(expression: &Expr<'_>) -> bool { + let mut recursive_visitor = ReturnBreakContinueMacroVisitor::new(); + recursive_visitor.visit_expr(expression); + recursive_visitor.seen_return_break_continue +} + +/// Extracts the body of a given arm. If the arm contains only an expression, +/// then it returns the expression. Otherwise, it returns the entire block +fn extract_body_from_arm<'a>(arm: &'a Arm<'a>) -> Option<&'a Expr<'a>> { + if let ExprKind::Block( + Block { + stmts: statements, + expr: Some(expr), + .. + }, + _, + ) = &arm.body.kind + { + if let [] = statements { + Some(&expr) + } else { + Some(&arm.body) + } + } else { + None + } +} + +/// If this is the else body of an if/else expression, then we need to wrap +/// it in curcly braces. Otherwise, we don't. +fn should_wrap_in_braces(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { + utils::get_enclosing_block(cx, expr.hir_id).map_or(false, |parent| { + if let Some(Expr { + kind: + ExprKind::Match( + _, + arms, + MatchSource::IfDesugar { + contains_else_clause: true, + } + | MatchSource::IfLetDesugar { + contains_else_clause: true, + }, + ), + .. + }) = parent.expr + { + expr.hir_id == arms[1].body.hir_id + } else { + false + } + }) +} + +fn format_option_in_sugg(cx: &LateContext<'_>, cond_expr: &Expr<'_>, as_ref: bool, as_mut: bool) -> String { + format!( + "{}{}", + Sugg::hir(cx, cond_expr, "..").maybe_par(), + if as_mut { + ".as_mut()" + } else if as_ref { + ".as_ref()" + } else { + "" + } + ) +} + +/// If this expression is the option if let/else construct we're detecting, then +/// this function returns an `OptionIfLetElseOccurence` struct with details if +/// this construct is found, or None if this construct is not found. +fn detect_option_if_let_else(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<OptionIfLetElseOccurence> { + if_chain! { + if !utils::in_macro(expr.span); // Don't lint macros, because it behaves weirdly + if let ExprKind::Match(cond_expr, arms, MatchSource::IfLetDesugar{contains_else_clause: true}) = &expr.kind; + if arms.len() == 2; + if !is_result_ok(cx, cond_expr); // Don't lint on Result::ok because a different lint does it already + if let PatKind::TupleStruct(struct_qpath, &[inner_pat], _) = &arms[0].pat.kind; + if utils::match_qpath(struct_qpath, &paths::OPTION_SOME); + if let PatKind::Binding(bind_annotation, _, id, _) = &inner_pat.kind; + if !contains_return_break_continue_macro(arms[0].body); + if !contains_return_break_continue_macro(arms[1].body); + then { + let capture_mut = if bind_annotation == &BindingAnnotation::Mutable { "mut " } else { "" }; + let some_body = extract_body_from_arm(&arms[0])?; + let none_body = extract_body_from_arm(&arms[1])?; + let method_sugg = match &none_body.kind { + ExprKind::Block(..) => "map_or_else", + _ => "map_or", + }; + let capture_name = id.name.to_ident_string(); + let wrap_braces = should_wrap_in_braces(cx, expr); + let (as_ref, as_mut) = match &cond_expr.kind { + ExprKind::AddrOf(_, Mutability::Not, _) => (true, false), + ExprKind::AddrOf(_, Mutability::Mut, _) => (false, true), + _ => (bind_annotation == &BindingAnnotation::Ref, bind_annotation == &BindingAnnotation::RefMut), + }; + let cond_expr = match &cond_expr.kind { + // Pointer dereferencing happens automatically, so we can omit it in the suggestion + ExprKind::Unary(UnOp::UnDeref, expr) | ExprKind::AddrOf(_, _, expr) => expr, + _ => cond_expr, + }; + Some(OptionIfLetElseOccurence { + option: format_option_in_sugg(cx, cond_expr, as_ref, as_mut), + method_sugg: method_sugg.to_string(), + some_expr: format!("|{}{}| {}", capture_mut, capture_name, Sugg::hir(cx, some_body, "..")), + none_expr: format!("{}{}", if method_sugg == "map_or" { "" } else { "|| " }, Sugg::hir(cx, none_body, "..")), + wrap_braces, + }) + } else { + None + } + } +} + +impl<'a> LateLintPass<'a> for OptionIfLetElse { + fn check_expr(&mut self, cx: &LateContext<'a>, expr: &Expr<'_>) { + if let Some(detection) = detect_option_if_let_else(cx, expr) { + span_lint_and_sugg( + cx, + OPTION_IF_LET_ELSE, + expr.span, + format!("use Option::{} instead of an if let/else", detection.method_sugg).as_str(), + "try", + format!( + "{}{}.{}({}, {}){}", + if detection.wrap_braces { "{ " } else { "" }, + detection.option, + detection.method_sugg, + detection.none_expr, + detection.some_expr, + if detection.wrap_braces { " }" } else { "" }, + ), + Applicability::MaybeIncorrect, + ); + } + } +} diff --git a/src/tools/clippy/clippy_lints/src/pattern_type_mismatch.rs b/src/tools/clippy/clippy_lints/src/pattern_type_mismatch.rs new file mode 100644 index 00000000000..a49dc87c0b4 --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/pattern_type_mismatch.rs @@ -0,0 +1,311 @@ +use crate::utils::{last_path_segment, span_lint_and_help}; +use rustc_hir::{ + intravisit, Body, Expr, ExprKind, FieldPat, FnDecl, HirId, LocalSource, MatchSource, Mutability, Pat, PatKind, + QPath, Stmt, StmtKind, +}; +use rustc_lint::{LateContext, LateLintPass, LintContext}; +use rustc_middle::lint::in_external_macro; +use rustc_middle::ty::subst::SubstsRef; +use rustc_middle::ty::{AdtDef, FieldDef, Ty, TyKind, VariantDef}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::source_map::Span; + +declare_clippy_lint! { + /// **What it does:** Checks for patterns that aren't exact representations of the types + /// they are applied to. + /// + /// To satisfy this lint, you will have to adjust either the expression that is matched + /// against or the pattern itself, as well as the bindings that are introduced by the + /// adjusted patterns. For matching you will have to either dereference the expression + /// with the `*` operator, or amend the patterns to explicitly match against `&<pattern>` + /// or `&mut <pattern>` depending on the reference mutability. For the bindings you need + /// to use the inverse. You can leave them as plain bindings if you wish for the value + /// to be copied, but you must use `ref mut <variable>` or `ref <variable>` to construct + /// a reference into the matched structure. + /// + /// If you are looking for a way to learn about ownership semantics in more detail, it + /// is recommended to look at IDE options available to you to highlight types, lifetimes + /// and reference semantics in your code. The available tooling would expose these things + /// in a general way even outside of the various pattern matching mechanics. Of course + /// this lint can still be used to highlight areas of interest and ensure a good understanding + /// of ownership semantics. + /// + /// **Why is this bad?** It isn't bad in general. But in some contexts it can be desirable + /// because it increases ownership hints in the code, and will guard against some changes + /// in ownership. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// This example shows the basic adjustments necessary to satisfy the lint. Note how + /// the matched expression is explicitly dereferenced with `*` and the `inner` variable + /// is bound to a shared borrow via `ref inner`. + /// + /// ```rust,ignore + /// // Bad + /// let value = &Some(Box::new(23)); + /// match value { + /// Some(inner) => println!("{}", inner), + /// None => println!("none"), + /// } + /// + /// // Good + /// let value = &Some(Box::new(23)); + /// match *value { + /// Some(ref inner) => println!("{}", inner), + /// None => println!("none"), + /// } + /// ``` + /// + /// The following example demonstrates one of the advantages of the more verbose style. + /// Note how the second version uses `ref mut a` to explicitly declare `a` a shared mutable + /// borrow, while `b` is simply taken by value. This ensures that the loop body cannot + /// accidentally modify the wrong part of the structure. + /// + /// ```rust,ignore + /// // Bad + /// let mut values = vec![(2, 3), (3, 4)]; + /// for (a, b) in &mut values { + /// *a += *b; + /// } + /// + /// // Good + /// let mut values = vec![(2, 3), (3, 4)]; + /// for &mut (ref mut a, b) in &mut values { + /// *a += b; + /// } + /// ``` + pub PATTERN_TYPE_MISMATCH, + restriction, + "type of pattern does not match the expression type" +} + +declare_lint_pass!(PatternTypeMismatch => [PATTERN_TYPE_MISMATCH]); + +impl<'tcx> LateLintPass<'tcx> for PatternTypeMismatch { + fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) { + if let StmtKind::Local(ref local) = stmt.kind { + if let Some(init) = &local.init { + if let Some(init_ty) = cx.tables().node_type_opt(init.hir_id) { + let pat = &local.pat; + if in_external_macro(cx.sess(), pat.span) { + return; + } + let deref_possible = match local.source { + LocalSource::Normal => DerefPossible::Possible, + _ => DerefPossible::Impossible, + }; + apply_lint(cx, pat, init_ty, deref_possible); + } + } + } + } + + fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) { + if let ExprKind::Match(ref expr, arms, source) = expr.kind { + match source { + MatchSource::Normal | MatchSource::IfLetDesugar { .. } | MatchSource::WhileLetDesugar => { + if let Some(expr_ty) = cx.tables().node_type_opt(expr.hir_id) { + 'pattern_checks: for arm in arms { + let pat = &arm.pat; + if in_external_macro(cx.sess(), pat.span) { + continue 'pattern_checks; + } + if apply_lint(cx, pat, expr_ty, DerefPossible::Possible) { + break 'pattern_checks; + } + } + } + }, + _ => (), + } + } + } + + fn check_fn( + &mut self, + cx: &LateContext<'tcx>, + _: intravisit::FnKind<'tcx>, + _: &'tcx FnDecl<'_>, + body: &'tcx Body<'_>, + _: Span, + hir_id: HirId, + ) { + if let Some(fn_sig) = cx.tables().liberated_fn_sigs().get(hir_id) { + for (param, ty) in body.params.iter().zip(fn_sig.inputs().iter()) { + apply_lint(cx, ¶m.pat, ty, DerefPossible::Impossible); + } + } + } +} + +#[derive(Debug, Clone, Copy)] +enum DerefPossible { + Possible, + Impossible, +} + +fn apply_lint<'tcx>(cx: &LateContext<'tcx>, pat: &Pat<'_>, expr_ty: Ty<'tcx>, deref_possible: DerefPossible) -> bool { + let maybe_mismatch = find_first_mismatch(cx, pat, expr_ty, Level::Top); + if let Some((span, mutability, level)) = maybe_mismatch { + span_lint_and_help( + cx, + PATTERN_TYPE_MISMATCH, + span, + "type of pattern does not match the expression type", + None, + &format!( + "{}explicitly match against a `{}` pattern and adjust the enclosed variable bindings", + match (deref_possible, level) { + (DerefPossible::Possible, Level::Top) => "use `*` to dereference the match expression or ", + _ => "", + }, + match mutability { + Mutability::Mut => "&mut _", + Mutability::Not => "&_", + }, + ), + ); + true + } else { + false + } +} + +#[derive(Debug, Copy, Clone)] +enum Level { + Top, + Lower, +} + +#[allow(rustc::usage_of_ty_tykind)] +fn find_first_mismatch<'tcx>( + cx: &LateContext<'tcx>, + pat: &Pat<'_>, + ty: Ty<'tcx>, + level: Level, +) -> Option<(Span, Mutability, Level)> { + if let PatKind::Ref(ref sub_pat, _) = pat.kind { + if let TyKind::Ref(_, sub_ty, _) = ty.kind { + return find_first_mismatch(cx, sub_pat, sub_ty, Level::Lower); + } + } + + if let TyKind::Ref(_, _, mutability) = ty.kind { + if is_non_ref_pattern(&pat.kind) { + return Some((pat.span, mutability, level)); + } + } + + if let PatKind::Struct(ref qpath, ref field_pats, _) = pat.kind { + if let TyKind::Adt(ref adt_def, ref substs_ref) = ty.kind { + if let Some(variant) = get_variant(adt_def, qpath) { + let field_defs = &variant.fields; + return find_first_mismatch_in_struct(cx, field_pats, field_defs, substs_ref); + } + } + } + + if let PatKind::TupleStruct(ref qpath, ref pats, _) = pat.kind { + if let TyKind::Adt(ref adt_def, ref substs_ref) = ty.kind { + if let Some(variant) = get_variant(adt_def, qpath) { + let field_defs = &variant.fields; + let ty_iter = field_defs.iter().map(|field_def| field_def.ty(cx.tcx, substs_ref)); + return find_first_mismatch_in_tuple(cx, pats, ty_iter); + } + } + } + + if let PatKind::Tuple(ref pats, _) = pat.kind { + if let TyKind::Tuple(..) = ty.kind { + return find_first_mismatch_in_tuple(cx, pats, ty.tuple_fields()); + } + } + + if let PatKind::Or(sub_pats) = pat.kind { + for pat in sub_pats { + let maybe_mismatch = find_first_mismatch(cx, pat, ty, level); + if let Some(mismatch) = maybe_mismatch { + return Some(mismatch); + } + } + } + + None +} + +fn get_variant<'a>(adt_def: &'a AdtDef, qpath: &QPath<'_>) -> Option<&'a VariantDef> { + if adt_def.is_struct() { + if let Some(variant) = adt_def.variants.iter().next() { + return Some(variant); + } + } + + if adt_def.is_enum() { + let pat_ident = last_path_segment(qpath).ident; + for variant in &adt_def.variants { + if variant.ident == pat_ident { + return Some(variant); + } + } + } + + None +} + +fn find_first_mismatch_in_tuple<'tcx, I>( + cx: &LateContext<'tcx>, + pats: &[&Pat<'_>], + ty_iter_src: I, +) -> Option<(Span, Mutability, Level)> +where + I: IntoIterator<Item = Ty<'tcx>>, +{ + let mut field_tys = ty_iter_src.into_iter(); + 'fields: for pat in pats { + let field_ty = if let Some(ty) = field_tys.next() { + ty + } else { + break 'fields; + }; + + let maybe_mismatch = find_first_mismatch(cx, pat, field_ty, Level::Lower); + if let Some(mismatch) = maybe_mismatch { + return Some(mismatch); + } + } + + None +} + +fn find_first_mismatch_in_struct<'tcx>( + cx: &LateContext<'tcx>, + field_pats: &[FieldPat<'_>], + field_defs: &[FieldDef], + substs_ref: SubstsRef<'tcx>, +) -> Option<(Span, Mutability, Level)> { + for field_pat in field_pats { + 'definitions: for field_def in field_defs { + if field_pat.ident == field_def.ident { + let field_ty = field_def.ty(cx.tcx, substs_ref); + let pat = &field_pat.pat; + let maybe_mismatch = find_first_mismatch(cx, pat, field_ty, Level::Lower); + if let Some(mismatch) = maybe_mismatch { + return Some(mismatch); + } + break 'definitions; + } + } + } + + None +} + +fn is_non_ref_pattern(pat_kind: &PatKind<'_>) -> bool { + match pat_kind { + PatKind::Struct(..) | PatKind::Tuple(..) | PatKind::TupleStruct(..) | PatKind::Path(..) => true, + PatKind::Or(sub_pats) => sub_pats.iter().any(|pat| is_non_ref_pattern(&pat.kind)), + _ => false, + } +} diff --git a/src/tools/clippy/clippy_lints/src/precedence.rs b/src/tools/clippy/clippy_lints/src/precedence.rs index 23793678fa0..4797771e7bd 100644 --- a/src/tools/clippy/clippy_lints/src/precedence.rs +++ b/src/tools/clippy/clippy_lints/src/precedence.rs @@ -148,17 +148,11 @@ fn is_arith_expr(expr: &Expr) -> bool { #[must_use] fn is_bit_op(op: BinOpKind) -> bool { use rustc_ast::ast::BinOpKind::{BitAnd, BitOr, BitXor, Shl, Shr}; - match op { - BitXor | BitAnd | BitOr | Shl | Shr => true, - _ => false, - } + matches!(op, BitXor | BitAnd | BitOr | Shl | Shr) } #[must_use] fn is_arith_op(op: BinOpKind) -> bool { use rustc_ast::ast::BinOpKind::{Add, Div, Mul, Rem, Sub}; - match op { - Add | Sub | Mul | Div | Rem => true, - _ => false, - } + matches!(op, Add | Sub | Mul | Div | Rem) } diff --git a/src/tools/clippy/clippy_lints/src/ranges.rs b/src/tools/clippy/clippy_lints/src/ranges.rs index c164ec9aaf1..dd608de5723 100644 --- a/src/tools/clippy/clippy_lints/src/ranges.rs +++ b/src/tools/clippy/clippy_lints/src/ranges.rs @@ -52,6 +52,11 @@ declare_clippy_lint! { /// exclusive ranges, because they essentially add an extra branch that /// LLVM may fail to hoist out of the loop. /// + /// This will cause a warning that cannot be fixed if the consumer of the + /// range only accepts a specific range type, instead of the generic + /// `RangeBounds` trait + /// ([#3307](https://github.com/rust-lang/rust-clippy/issues/3307)). + /// /// **Example:** /// ```rust,ignore /// for x..(y+1) { .. } @@ -72,7 +77,10 @@ declare_clippy_lint! { /// **Why is this bad?** The code is more readable with an exclusive range /// like `x..y`. /// - /// **Known problems:** None. + /// **Known problems:** This will cause a warning that cannot be fixed if + /// the consumer of the range only accepts a specific range type, instead of + /// the generic `RangeBounds` trait + /// ([#3307](https://github.com/rust-lang/rust-clippy/issues/3307)). /// /// **Example:** /// ```rust,ignore @@ -83,7 +91,7 @@ declare_clippy_lint! { /// for x..y { .. } /// ``` pub RANGE_MINUS_ONE, - complexity, + pedantic, "`x..=(y-1)` reads better as `x..y`" } diff --git a/src/tools/clippy/clippy_lints/src/redundant_pattern_matching.rs b/src/tools/clippy/clippy_lints/src/redundant_pattern_matching.rs deleted file mode 100644 index d8d16efb978..00000000000 --- a/src/tools/clippy/clippy_lints/src/redundant_pattern_matching.rs +++ /dev/null @@ -1,260 +0,0 @@ -use crate::utils::{in_constant, match_qpath, match_trait_method, paths, snippet, span_lint_and_then}; -use if_chain::if_chain; -use rustc_ast::ast::LitKind; -use rustc_errors::Applicability; -use rustc_hir::{Arm, Expr, ExprKind, HirId, MatchSource, PatKind, QPath}; -use rustc_lint::{LateContext, LateLintPass}; -use rustc_middle::ty; -use rustc_mir::const_eval::is_const_fn; -use rustc_session::{declare_lint_pass, declare_tool_lint}; -use rustc_span::source_map::Symbol; - -declare_clippy_lint! { - /// **What it does:** Lint for redundant pattern matching over `Result` or - /// `Option` - /// - /// **Why is this bad?** It's more concise and clear to just use the proper - /// utility function - /// - /// **Known problems:** None. - /// - /// **Example:** - /// - /// ```rust - /// if let Ok(_) = Ok::<i32, i32>(42) {} - /// if let Err(_) = Err::<i32, i32>(42) {} - /// if let None = None::<()> {} - /// if let Some(_) = Some(42) {} - /// match Ok::<i32, i32>(42) { - /// Ok(_) => true, - /// Err(_) => false, - /// }; - /// ``` - /// - /// The more idiomatic use would be: - /// - /// ```rust - /// if Ok::<i32, i32>(42).is_ok() {} - /// if Err::<i32, i32>(42).is_err() {} - /// if None::<()>.is_none() {} - /// if Some(42).is_some() {} - /// Ok::<i32, i32>(42).is_ok(); - /// ``` - pub REDUNDANT_PATTERN_MATCHING, - style, - "use the proper utility function avoiding an `if let`" -} - -declare_lint_pass!(RedundantPatternMatching => [REDUNDANT_PATTERN_MATCHING]); - -impl<'tcx> LateLintPass<'tcx> for RedundantPatternMatching { - fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) { - if let ExprKind::Match(op, arms, ref match_source) = &expr.kind { - match match_source { - MatchSource::Normal => find_sugg_for_match(cx, expr, op, arms), - MatchSource::IfLetDesugar { .. } => find_sugg_for_if_let(cx, expr, op, arms, "if"), - MatchSource::WhileLetDesugar => find_sugg_for_if_let(cx, expr, op, arms, "while"), - _ => return, - } - } - } -} - -fn find_sugg_for_if_let<'tcx>( - cx: &LateContext<'tcx>, - expr: &'tcx Expr<'_>, - op: &Expr<'_>, - arms: &[Arm<'_>], - keyword: &'static str, -) { - fn find_suggestion(cx: &LateContext<'_>, hir_id: HirId, path: &QPath<'_>) -> Option<&'static str> { - if match_qpath(path, &paths::RESULT_OK) && can_suggest(cx, hir_id, sym!(result_type), "is_ok") { - return Some("is_ok()"); - } - if match_qpath(path, &paths::RESULT_ERR) && can_suggest(cx, hir_id, sym!(result_type), "is_err") { - return Some("is_err()"); - } - if match_qpath(path, &paths::OPTION_SOME) && can_suggest(cx, hir_id, sym!(option_type), "is_some") { - return Some("is_some()"); - } - if match_qpath(path, &paths::OPTION_NONE) && can_suggest(cx, hir_id, sym!(option_type), "is_none") { - return Some("is_none()"); - } - None - } - - let hir_id = expr.hir_id; - let good_method = match arms[0].pat.kind { - PatKind::TupleStruct(ref path, ref patterns, _) if patterns.len() == 1 => { - if let PatKind::Wild = patterns[0].kind { - find_suggestion(cx, hir_id, path) - } else { - None - } - }, - PatKind::Path(ref path) => find_suggestion(cx, hir_id, path), - _ => None, - }; - let good_method = match good_method { - Some(method) => method, - None => return, - }; - - // check that `while_let_on_iterator` lint does not trigger - if_chain! { - if keyword == "while"; - if let ExprKind::MethodCall(method_path, _, _, _) = op.kind; - if method_path.ident.name == sym!(next); - if match_trait_method(cx, op, &paths::ITERATOR); - then { - return; - } - } - - span_lint_and_then( - cx, - REDUNDANT_PATTERN_MATCHING, - arms[0].pat.span, - &format!("redundant pattern matching, consider using `{}`", good_method), - |diag| { - // while let ... = ... { ... } - // ^^^^^^^^^^^^^^^^^^^^^^^^^^^ - let expr_span = expr.span; - - // while let ... = ... { ... } - // ^^^ - let op_span = op.span.source_callsite(); - - // while let ... = ... { ... } - // ^^^^^^^^^^^^^^^^^^^ - let span = expr_span.until(op_span.shrink_to_hi()); - diag.span_suggestion( - span, - "try this", - format!("{} {}.{}", keyword, snippet(cx, op_span, "_"), good_method), - Applicability::MachineApplicable, // snippet - ); - }, - ); -} - -fn find_sugg_for_match<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, op: &Expr<'_>, arms: &[Arm<'_>]) { - if arms.len() == 2 { - let node_pair = (&arms[0].pat.kind, &arms[1].pat.kind); - - let hir_id = expr.hir_id; - let found_good_method = match node_pair { - ( - PatKind::TupleStruct(ref path_left, ref patterns_left, _), - PatKind::TupleStruct(ref path_right, ref patterns_right, _), - ) if patterns_left.len() == 1 && patterns_right.len() == 1 => { - if let (PatKind::Wild, PatKind::Wild) = (&patterns_left[0].kind, &patterns_right[0].kind) { - find_good_method_for_match( - arms, - path_left, - path_right, - &paths::RESULT_OK, - &paths::RESULT_ERR, - "is_ok()", - "is_err()", - || can_suggest(cx, hir_id, sym!(result_type), "is_ok"), - || can_suggest(cx, hir_id, sym!(result_type), "is_err"), - ) - } else { - None - } - }, - (PatKind::TupleStruct(ref path_left, ref patterns, _), PatKind::Path(ref path_right)) - | (PatKind::Path(ref path_left), PatKind::TupleStruct(ref path_right, ref patterns, _)) - if patterns.len() == 1 => - { - if let PatKind::Wild = patterns[0].kind { - find_good_method_for_match( - arms, - path_left, - path_right, - &paths::OPTION_SOME, - &paths::OPTION_NONE, - "is_some()", - "is_none()", - || can_suggest(cx, hir_id, sym!(option_type), "is_some"), - || can_suggest(cx, hir_id, sym!(option_type), "is_none"), - ) - } else { - None - } - }, - _ => None, - }; - - if let Some(good_method) = found_good_method { - span_lint_and_then( - cx, - REDUNDANT_PATTERN_MATCHING, - expr.span, - &format!("redundant pattern matching, consider using `{}`", good_method), - |diag| { - let span = expr.span.to(op.span); - diag.span_suggestion( - span, - "try this", - format!("{}.{}", snippet(cx, op.span, "_"), good_method), - Applicability::MaybeIncorrect, // snippet - ); - }, - ); - } - } -} - -#[allow(clippy::too_many_arguments)] -fn find_good_method_for_match<'a>( - arms: &[Arm<'_>], - path_left: &QPath<'_>, - path_right: &QPath<'_>, - expected_left: &[&str], - expected_right: &[&str], - should_be_left: &'a str, - should_be_right: &'a str, - can_suggest_left: impl Fn() -> bool, - can_suggest_right: impl Fn() -> bool, -) -> Option<&'a str> { - let body_node_pair = if match_qpath(path_left, expected_left) && match_qpath(path_right, expected_right) { - (&(*arms[0].body).kind, &(*arms[1].body).kind) - } else if match_qpath(path_right, expected_left) && match_qpath(path_left, expected_right) { - (&(*arms[1].body).kind, &(*arms[0].body).kind) - } else { - return None; - }; - - match body_node_pair { - (ExprKind::Lit(ref lit_left), ExprKind::Lit(ref lit_right)) => match (&lit_left.node, &lit_right.node) { - (LitKind::Bool(true), LitKind::Bool(false)) if can_suggest_left() => Some(should_be_left), - (LitKind::Bool(false), LitKind::Bool(true)) if can_suggest_right() => Some(should_be_right), - _ => None, - }, - _ => None, - } -} - -fn can_suggest(cx: &LateContext<'_>, hir_id: HirId, diag_item: Symbol, name: &str) -> bool { - if !in_constant(cx, hir_id) { - return true; - } - - // Avoid suggesting calls to non-`const fn`s in const contexts, see #5697. - cx.tcx - .get_diagnostic_item(diag_item) - .and_then(|def_id| { - cx.tcx.inherent_impls(def_id).iter().find_map(|imp| { - cx.tcx - .associated_items(*imp) - .in_definition_order() - .find_map(|item| match item.kind { - ty::AssocKind::Fn if item.ident.name.as_str() == name => Some(item.def_id), - _ => None, - }) - }) - }) - .map_or(false, |def_id| is_const_fn(cx.tcx, def_id)) -} diff --git a/src/tools/clippy/clippy_lints/src/regex.rs b/src/tools/clippy/clippy_lints/src/regex.rs index b67abad6ccb..f204a0ffb2c 100644 --- a/src/tools/clippy/clippy_lints/src/regex.rs +++ b/src/tools/clippy/clippy_lints/src/regex.rs @@ -1,9 +1,9 @@ use crate::consts::{constant, Constant}; -use crate::utils::{is_expn_of, match_def_path, match_type, paths, span_lint, span_lint_and_help}; +use crate::utils::{match_def_path, paths, span_lint, span_lint_and_help}; use if_chain::if_chain; use rustc_ast::ast::{LitKind, StrStyle}; use rustc_data_structures::fx::FxHashSet; -use rustc_hir::{Block, BorrowKind, Crate, Expr, ExprKind, HirId}; +use rustc_hir::{BorrowKind, Expr, ExprKind, HirId}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_tool_lint, impl_lint_pass}; use rustc_span::source_map::{BytePos, Span}; @@ -46,66 +46,15 @@ declare_clippy_lint! { "trivial regular expressions" } -declare_clippy_lint! { - /// **What it does:** Checks for usage of `regex!(_)` which (as of now) is - /// usually slower than `Regex::new(_)` unless called in a loop (which is a bad - /// idea anyway). - /// - /// **Why is this bad?** Performance, at least for now. The macro version is - /// likely to catch up long-term, but for now the dynamic version is faster. - /// - /// **Known problems:** None. - /// - /// **Example:** - /// ```ignore - /// regex!("foo|bar") - /// ``` - pub REGEX_MACRO, - style, - "use of `regex!(_)` instead of `Regex::new(_)`" -} - #[derive(Clone, Default)] pub struct Regex { spans: FxHashSet<Span>, last: Option<HirId>, } -impl_lint_pass!(Regex => [INVALID_REGEX, REGEX_MACRO, TRIVIAL_REGEX]); +impl_lint_pass!(Regex => [INVALID_REGEX, TRIVIAL_REGEX]); impl<'tcx> LateLintPass<'tcx> for Regex { - fn check_crate(&mut self, _: &LateContext<'tcx>, _: &'tcx Crate<'_>) { - self.spans.clear(); - } - - fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'_>) { - if_chain! { - if self.last.is_none(); - if let Some(ref expr) = block.expr; - if match_type(cx, cx.tables().expr_ty(expr), &paths::REGEX); - if let Some(span) = is_expn_of(expr.span, "regex"); - then { - if !self.spans.contains(&span) { - span_lint( - cx, - REGEX_MACRO, - span, - "`regex!(_)` found. \ - Please use `Regex::new(_)`, which is faster for now." - ); - self.spans.insert(span); - } - self.last = Some(block.hir_id); - } - } - } - - fn check_block_post(&mut self, _: &LateContext<'tcx>, block: &'tcx Block<'_>) { - if self.last.map_or(false, |id| block.hir_id == id) { - self.last = None; - } - } - fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) { if_chain! { if let ExprKind::Call(ref fun, ref args) = expr.kind; @@ -150,12 +99,7 @@ fn is_trivial_regex(s: ®ex_syntax::hir::Hir) -> Option<&'static str> { use regex_syntax::hir::Anchor::{EndText, StartText}; use regex_syntax::hir::HirKind::{Alternation, Anchor, Concat, Empty, Literal}; - let is_literal = |e: &[regex_syntax::hir::Hir]| { - e.iter().all(|e| match *e.kind() { - Literal(_) => true, - _ => false, - }) - }; + let is_literal = |e: &[regex_syntax::hir::Hir]| e.iter().all(|e| matches!(*e.kind(), Literal(_))); match *s.kind() { Empty | Anchor(_) => Some("the regex is unlikely to be useful as it is"), diff --git a/src/tools/clippy/clippy_lints/src/repeat_once.rs b/src/tools/clippy/clippy_lints/src/repeat_once.rs new file mode 100644 index 00000000000..a3af369e41e --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/repeat_once.rs @@ -0,0 +1,82 @@ +use crate::consts::{constant_context, Constant}; +use crate::utils::{in_macro, is_type_diagnostic_item, snippet, span_lint_and_sugg, walk_ptrs_ty}; +use if_chain::if_chain; +use rustc_errors::Applicability; +use rustc_hir::{Expr, ExprKind}; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; + +declare_clippy_lint! { + /// **What it does:** Checks for usage of `.repeat(1)` and suggest the following method for each types. + /// - `.to_string()` for `str` + /// - `.clone()` for `String` + /// - `.to_vec()` for `slice` + /// + /// **Why is this bad?** For example, `String.repeat(1)` is equivalent to `.clone()`. If cloning the string is the intention behind this, `clone()` should be used. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// fn main() { + /// let x = String::from("hello world").repeat(1); + /// } + /// ``` + /// Use instead: + /// ```rust + /// fn main() { + /// let x = String::from("hello world").clone(); + /// } + /// ``` + pub REPEAT_ONCE, + complexity, + "using `.repeat(1)` instead of `String.clone()`, `str.to_string()` or `slice.to_vec()` " +} + +declare_lint_pass!(RepeatOnce => [REPEAT_ONCE]); + +impl<'tcx> LateLintPass<'tcx> for RepeatOnce { + fn check_expr(&mut self, cx: &LateContext<'_>, expr: &'tcx Expr<'_>) { + if_chain! { + if let ExprKind::MethodCall(ref path, _, ref args, _) = expr.kind; + if path.ident.name == sym!(repeat); + if let Some(Constant::Int(1)) = constant_context(cx, cx.tables()).expr(&args[1]); + if !in_macro(args[0].span); + then { + let ty = walk_ptrs_ty(cx.tables().expr_ty(&args[0])); + if ty.is_str() { + span_lint_and_sugg( + cx, + REPEAT_ONCE, + expr.span, + "calling `repeat(1)` on str", + "consider using `.to_string()` instead", + format!("{}.to_string()", snippet(cx, args[0].span, r#""...""#)), + Applicability::MachineApplicable, + ); + } else if ty.builtin_index().is_some() { + span_lint_and_sugg( + cx, + REPEAT_ONCE, + expr.span, + "calling `repeat(1)` on slice", + "consider using `.to_vec()` instead", + format!("{}.to_vec()", snippet(cx, args[0].span, r#""...""#)), + Applicability::MachineApplicable, + ); + } else if is_type_diagnostic_item(cx, ty, sym!(string_type)) { + span_lint_and_sugg( + cx, + REPEAT_ONCE, + expr.span, + "calling `repeat(1)` on a string literal", + "consider using `.clone()` instead", + format!("{}.clone()", snippet(cx, args[0].span, r#""...""#)), + Applicability::MachineApplicable, + ); + } + } + } + } +} diff --git a/src/tools/clippy/clippy_lints/src/returns.rs b/src/tools/clippy/clippy_lints/src/returns.rs index 3c939744173..faef7e724dd 100644 --- a/src/tools/clippy/clippy_lints/src/returns.rs +++ b/src/tools/clippy/clippy_lints/src/returns.rs @@ -259,15 +259,15 @@ fn is_unit_expr(expr: &ast::Expr) -> bool { fn lint_unneeded_unit_return(cx: &EarlyContext<'_>, ty: &ast::Ty, span: Span) { let (ret_span, appl) = if let Ok(fn_source) = cx.sess().source_map().span_to_snippet(span.with_hi(ty.span.hi())) { - if let Some(rpos) = fn_source.rfind("->") { - #[allow(clippy::cast_possible_truncation)] - ( - ty.span.with_lo(BytePos(span.lo().0 + rpos as u32)), - Applicability::MachineApplicable, - ) - } else { - (ty.span, Applicability::MaybeIncorrect) - } + fn_source + .rfind("->") + .map_or((ty.span, Applicability::MaybeIncorrect), |rpos| { + ( + #[allow(clippy::cast_possible_truncation)] + ty.span.with_lo(BytePos(span.lo().0 + rpos as u32)), + Applicability::MachineApplicable, + ) + }) } else { (ty.span, Applicability::MaybeIncorrect) }; diff --git a/src/tools/clippy/clippy_lints/src/shadow.rs b/src/tools/clippy/clippy_lints/src/shadow.rs index 7da47ee4ff9..194786c5c41 100644 --- a/src/tools/clippy/clippy_lints/src/shadow.rs +++ b/src/tools/clippy/clippy_lints/src/shadow.rs @@ -165,14 +165,7 @@ fn check_local<'tcx>(cx: &LateContext<'tcx>, local: &'tcx Local<'_>, bindings: & fn is_binding(cx: &LateContext<'_>, pat_id: HirId) -> bool { let var_ty = cx.tables().node_type_opt(pat_id); - if let Some(var_ty) = var_ty { - match var_ty.kind { - ty::Adt(..) => false, - _ => true, - } - } else { - false - } + var_ty.map_or(false, |var_ty| !matches!(var_ty.kind, ty::Adt(..))) } fn check_pat<'tcx>( diff --git a/src/tools/clippy/clippy_lints/src/temporary_assignment.rs b/src/tools/clippy/clippy_lints/src/temporary_assignment.rs index 509bbfd27c1..1aeff1baa36 100644 --- a/src/tools/clippy/clippy_lints/src/temporary_assignment.rs +++ b/src/tools/clippy/clippy_lints/src/temporary_assignment.rs @@ -25,13 +25,7 @@ declare_clippy_lint! { fn is_temporary(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { match &expr.kind { ExprKind::Struct(..) | ExprKind::Tup(..) => true, - ExprKind::Path(qpath) => { - if let Res::Def(DefKind::Const, ..) = cx.qpath_res(qpath, expr.hir_id) { - true - } else { - false - } - }, + ExprKind::Path(qpath) => matches!(cx.qpath_res(qpath, expr.hir_id), Res::Def(DefKind::Const, ..)), _ => false, } } diff --git a/src/tools/clippy/clippy_lints/src/trait_bounds.rs b/src/tools/clippy/clippy_lints/src/trait_bounds.rs index 9eb2079c3ca..0ef70311fb1 100644 --- a/src/tools/clippy/clippy_lints/src/trait_bounds.rs +++ b/src/tools/clippy/clippy_lints/src/trait_bounds.rs @@ -1,19 +1,19 @@ use crate::utils::{in_macro, snippet, snippet_with_applicability, span_lint_and_help, SpanlessHash}; +use if_chain::if_chain; use rustc_data_structures::fx::FxHashMap; use rustc_errors::Applicability; use rustc_hir::{GenericBound, Generics, WherePredicate}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_tool_lint, impl_lint_pass}; -#[derive(Copy, Clone)] -pub struct TraitBounds; - declare_clippy_lint! { /// **What it does:** This lint warns about unnecessary type repetitions in trait bounds /// /// **Why is this bad?** Repeating the type for every bound makes the code /// less readable than combining the bounds /// + /// **Known problems:** None. + /// /// **Example:** /// ```rust /// pub fn foo<T>(t: T) where T: Copy, T: Clone {} @@ -29,6 +29,18 @@ declare_clippy_lint! { "Types are repeated unnecessary in trait bounds use `+` instead of using `T: _, T: _`" } +#[derive(Copy, Clone)] +pub struct TraitBounds { + max_trait_bounds: u64, +} + +impl TraitBounds { + #[must_use] + pub fn new(max_trait_bounds: u64) -> Self { + Self { max_trait_bounds } + } +} + impl_lint_pass!(TraitBounds => [TYPE_REPETITION_IN_BOUNDS]); impl<'tcx> LateLintPass<'tcx> for TraitBounds { @@ -44,9 +56,14 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds { let mut map = FxHashMap::default(); let mut applicability = Applicability::MaybeIncorrect; for bound in gen.where_clause.predicates { - if let WherePredicate::BoundPredicate(ref p) = bound { + if_chain! { + if let WherePredicate::BoundPredicate(ref p) = bound; + if p.bounds.len() as u64 <= self.max_trait_bounds; + if !in_macro(p.span); let h = hash(&p.bounded_ty); - if let Some(ref v) = map.insert(h, p.bounds.iter().collect::<Vec<_>>()) { + if let Some(ref v) = map.insert(h, p.bounds.iter().collect::<Vec<_>>()); + + then { let mut hint_string = format!( "consider combining the bounds: `{}:", snippet(cx, p.bounded_ty.span, "_") diff --git a/src/tools/clippy/clippy_lints/src/types.rs b/src/tools/clippy/clippy_lints/src/types.rs index 68f51f0afdc..bca388ecdcc 100644 --- a/src/tools/clippy/clippy_lints/src/types.rs +++ b/src/tools/clippy/clippy_lints/src/types.rs @@ -775,11 +775,7 @@ impl<'tcx> LateLintPass<'tcx> for UnitArg { .iter() .filter(|arg| { if is_unit(cx.tables().expr_ty(arg)) && !is_unit_literal(arg) { - if let ExprKind::Match(.., MatchSource::TryDesugar) = &arg.kind { - false - } else { - true - } + !matches!(&arg.kind, ExprKind::Match(.., MatchSource::TryDesugar)) } else { false } @@ -899,17 +895,11 @@ fn is_questionmark_desugar_marked_call(expr: &Expr<'_>) -> bool { } fn is_unit(ty: Ty<'_>) -> bool { - match ty.kind { - ty::Tuple(slice) if slice.is_empty() => true, - _ => false, - } + matches!(ty.kind, ty::Tuple(slice) if slice.is_empty()) } fn is_unit_literal(expr: &Expr<'_>) -> bool { - match expr.kind { - ExprKind::Tup(ref slice) if slice.is_empty() => true, - _ => false, - } + matches!(expr.kind, ExprKind::Tup(ref slice) if slice.is_empty()) } declare_clippy_lint! { @@ -1154,10 +1144,7 @@ fn int_ty_to_nbits(typ: Ty<'_>, tcx: TyCtxt<'_>) -> u64 { } fn is_isize_or_usize(typ: Ty<'_>) -> bool { - match typ.kind { - ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize) => true, - _ => false, - } + matches!(typ.kind, ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize)) } fn span_precision_loss_lint(cx: &LateContext<'_>, expr: &Expr<'_>, cast_from: Ty<'_>, cast_to_f64: bool) { @@ -1205,16 +1192,19 @@ fn span_lossless_lint(cx: &LateContext<'_>, expr: &Expr<'_>, op: &Expr<'_>, cast // has parens on the outside, they are no longer needed. let mut applicability = Applicability::MachineApplicable; let opt = snippet_opt(cx, op.span); - let sugg = if let Some(ref snip) = opt { - if should_strip_parens(op, snip) { - &snip[1..snip.len() - 1] - } else { - snip.as_str() - } - } else { - applicability = Applicability::HasPlaceholders; - ".." - }; + let sugg = opt.as_ref().map_or_else( + || { + applicability = Applicability::HasPlaceholders; + ".." + }, + |snip| { + if should_strip_parens(op, snip) { + &snip[1..snip.len() - 1] + } else { + snip.as_str() + } + }, + ); span_lint_and_sugg( cx, @@ -1734,10 +1724,10 @@ impl<'tcx> Visitor<'tcx> for TypeComplexityVisitor { TyKind::TraitObject(ref param_bounds, _) => { let has_lifetime_parameters = param_bounds.iter().any(|bound| { - bound.bound_generic_params.iter().any(|gen| match gen.kind { - GenericParamKind::Lifetime { .. } => true, - _ => false, - }) + bound + .bound_generic_params + .iter() + .any(|gen| matches!(gen.kind, GenericParamKind::Lifetime { .. })) }); if has_lifetime_parameters { // complex trait bounds like A<'a, 'b> diff --git a/src/tools/clippy/clippy_lints/src/unnamed_address.rs b/src/tools/clippy/clippy_lints/src/unnamed_address.rs index b9aa202b328..25d136e564d 100644 --- a/src/tools/clippy/clippy_lints/src/unnamed_address.rs +++ b/src/tools/clippy/clippy_lints/src/unnamed_address.rs @@ -58,10 +58,10 @@ declare_lint_pass!(UnnamedAddress => [FN_ADDRESS_COMPARISONS, VTABLE_ADDRESS_COM impl LateLintPass<'_> for UnnamedAddress { fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) { fn is_comparison(binop: BinOpKind) -> bool { - match binop { - BinOpKind::Eq | BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ne | BinOpKind::Ge | BinOpKind::Gt => true, - _ => false, - } + matches!( + binop, + BinOpKind::Eq | BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ne | BinOpKind::Ge | BinOpKind::Gt + ) } fn is_trait_ptr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { @@ -72,11 +72,7 @@ impl LateLintPass<'_> for UnnamedAddress { } fn is_fn_def(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { - if let ty::FnDef(..) = cx.tables().expr_ty(expr).kind { - true - } else { - false - } + matches!(cx.tables().expr_ty(expr).kind, ty::FnDef(..)) } if_chain! { diff --git a/src/tools/clippy/clippy_lints/src/unnecessary_sort_by.rs b/src/tools/clippy/clippy_lints/src/unnecessary_sort_by.rs index d940776817c..91c1789a2ff 100644 --- a/src/tools/clippy/clippy_lints/src/unnecessary_sort_by.rs +++ b/src/tools/clippy/clippy_lints/src/unnecessary_sort_by.rs @@ -5,24 +5,23 @@ use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::{Expr, ExprKind, Mutability, Param, Pat, PatKind, Path, PathSegment, QPath}; use rustc_lint::{LateContext, LateLintPass}; +use rustc_middle::ty::{self, subst::GenericArgKind}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::symbol::Ident; declare_clippy_lint! { /// **What it does:** - /// Detects when people use `Vec::sort_by` and pass in a function + /// Detects uses of `Vec::sort_by` passing in a closure /// which compares the two arguments, either directly or indirectly. /// /// **Why is this bad?** /// It is more clear to use `Vec::sort_by_key` (or `Vec::sort` if - /// possible) than to use `Vec::sort_by` and and a more complicated + /// possible) than to use `Vec::sort_by` and a more complicated /// closure. /// /// **Known problems:** - /// If the suggested `Vec::sort_by_key` uses Reverse and it isn't - /// imported by a use statement in the current frame, then a `use` - /// statement that imports it will need to be added (which this lint - /// can't do). + /// If the suggested `Vec::sort_by_key` uses Reverse and it isn't already + /// imported by a use statement, then it will need to be added manually. /// /// **Example:** /// @@ -201,28 +200,41 @@ fn detect_lint(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<LintTrigger> { }; let vec_name = Sugg::hir(cx, &args[0], "..").to_string(); let unstable = name == "sort_unstable_by"; + if_chain! { if let ExprKind::Path(QPath::Resolved(_, Path { segments: [PathSegment { ident: left_name, .. }], .. })) = &left_expr.kind; if left_name == left_ident; then { - Some(LintTrigger::Sort(SortDetection { vec_name, unstable })) - } - else { - Some(LintTrigger::SortByKey(SortByKeyDetection { - vec_name, - unstable, - closure_arg, - closure_body, - reverse - })) + return Some(LintTrigger::Sort(SortDetection { vec_name, unstable })) + } else { + if !key_returns_borrow(cx, left_expr) { + return Some(LintTrigger::SortByKey(SortByKeyDetection { + vec_name, + unstable, + closure_arg, + closure_body, + reverse + })) + } } } - } else { - None } } + + None +} + +fn key_returns_borrow(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { + if let Some(def_id) = utils::fn_def_id(cx, expr) { + let output = cx.tcx.fn_sig(def_id).output(); + let ty = output.skip_binder(); + return matches!(ty.kind, ty::Ref(..)) + || ty.walk().any(|arg| matches!(arg.unpack(), GenericArgKind::Lifetime(_))); + } + + false } impl LateLintPass<'_> for UnnecessarySortBy { diff --git a/src/tools/clippy/clippy_lints/src/unnested_or_patterns.rs b/src/tools/clippy/clippy_lints/src/unnested_or_patterns.rs index 4d3682263f1..502bf0c4279 100644 --- a/src/tools/clippy/clippy_lints/src/unnested_or_patterns.rs +++ b/src/tools/clippy/clippy_lints/src/unnested_or_patterns.rs @@ -72,8 +72,8 @@ impl EarlyLintPass for UnnestedOrPatterns { } fn lint_unnested_or_patterns(cx: &EarlyContext<'_>, pat: &Pat) { - if !cx.sess.opts.unstable_features.is_nightly_build() { - // User cannot do `#![feature(or_patterns)]`, so bail. + if !cx.sess.features_untracked().or_patterns { + // Do not suggest nesting the patterns if the feature `or_patterns` is not enabled. return; } @@ -400,8 +400,8 @@ fn extend_with_matching( /// Are the patterns in `ps1` and `ps2` equal save for `ps1[idx]` compared to `ps2[idx]`? fn eq_pre_post(ps1: &[P<Pat>], ps2: &[P<Pat>], idx: usize) -> bool { - ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`. - && ps1.len() == ps2.len() + ps1.len() == ps2.len() + && ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`. && over(&ps1[..idx], &ps2[..idx], |l, r| eq_pat(l, r)) && over(&ps1[idx + 1..], &ps2[idx + 1..], |l, r| eq_pat(l, r)) } diff --git a/src/tools/clippy/clippy_lints/src/use_self.rs b/src/tools/clippy/clippy_lints/src/use_self.rs index f85db1e2006..776c6bc57ca 100644 --- a/src/tools/clippy/clippy_lints/src/use_self.rs +++ b/src/tools/clippy/clippy_lints/src/use_self.rs @@ -167,14 +167,11 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf { if let TyKind::Path(QPath::Resolved(_, ref item_path)) = item_type.kind; then { let parameters = &item_path.segments.last().expect(SEGMENTS_MSG).args; - let should_check = if let Some(ref params) = *parameters { - !params.parenthesized && !params.args.iter().any(|arg| match arg { - GenericArg::Lifetime(_) => true, - _ => false, - }) - } else { - true - }; + let should_check = parameters.as_ref().map_or( + true, + |params| !params.parenthesized + &&!params.args.iter().any(|arg| matches!(arg, GenericArg::Lifetime(_))) + ); if should_check { let visitor = &mut UseSelfVisitor { diff --git a/src/tools/clippy/clippy_lints/src/utils/ast_utils.rs b/src/tools/clippy/clippy_lints/src/utils/ast_utils.rs index e19a79dd8da..58c1103da9f 100755 --- a/src/tools/clippy/clippy_lints/src/utils/ast_utils.rs +++ b/src/tools/clippy/clippy_lints/src/utils/ast_utils.rs @@ -387,10 +387,7 @@ pub fn eq_use_tree_kind(l: &UseTreeKind, r: &UseTreeKind) -> bool { } pub fn eq_defaultness(l: Defaultness, r: Defaultness) -> bool { - match (l, r) { - (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_)) => true, - _ => false, - } + matches!((l, r), (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_))) } pub fn eq_vis(l: &Visibility, r: &Visibility) -> bool { diff --git a/src/tools/clippy/clippy_lints/src/utils/attrs.rs b/src/tools/clippy/clippy_lints/src/utils/attrs.rs index 4dcf6c105ec..4bb4b087c55 100644 --- a/src/tools/clippy/clippy_lints/src/utils/attrs.rs +++ b/src/tools/clippy/clippy_lints/src/utils/attrs.rs @@ -65,42 +65,45 @@ pub fn get_attr<'a>( }; let attr_segments = &attr.path.segments; if attr_segments.len() == 2 && attr_segments[0].ident.to_string() == "clippy" { - if let Some(deprecation_status) = - BUILTIN_ATTRIBUTES - .iter() - .find_map(|(builtin_name, deprecation_status)| { - if *builtin_name == attr_segments[1].ident.to_string() { - Some(deprecation_status) - } else { - None - } - }) - { - let mut diag = sess.struct_span_err(attr_segments[1].ident.span, "Usage of deprecated attribute"); - match *deprecation_status { - DeprecationStatus::Deprecated => { - diag.emit(); - false - }, - DeprecationStatus::Replaced(new_name) => { - diag.span_suggestion( - attr_segments[1].ident.span, - "consider using", - new_name.to_string(), - Applicability::MachineApplicable, - ); - diag.emit(); + BUILTIN_ATTRIBUTES + .iter() + .find_map(|(builtin_name, deprecation_status)| { + if *builtin_name == attr_segments[1].ident.to_string() { + Some(deprecation_status) + } else { + None + } + }) + .map_or_else( + || { + sess.span_err(attr_segments[1].ident.span, "Usage of unknown attribute"); false }, - DeprecationStatus::None => { - diag.cancel(); - attr_segments[1].ident.to_string() == name + |deprecation_status| { + let mut diag = + sess.struct_span_err(attr_segments[1].ident.span, "Usage of deprecated attribute"); + match *deprecation_status { + DeprecationStatus::Deprecated => { + diag.emit(); + false + }, + DeprecationStatus::Replaced(new_name) => { + diag.span_suggestion( + attr_segments[1].ident.span, + "consider using", + new_name.to_string(), + Applicability::MachineApplicable, + ); + diag.emit(); + false + }, + DeprecationStatus::None => { + diag.cancel(); + attr_segments[1].ident.to_string() == name + }, + } }, - } - } else { - sess.span_err(attr_segments[1].ident.span, "Usage of unknown attribute"); - false - } + ) } else { false } diff --git a/src/tools/clippy/clippy_lints/src/utils/conf.rs b/src/tools/clippy/clippy_lints/src/utils/conf.rs index c41befbf147..de425211e38 100644 --- a/src/tools/clippy/clippy_lints/src/utils/conf.rs +++ b/src/tools/clippy/clippy_lints/src/utils/conf.rs @@ -156,6 +156,8 @@ define_Conf! { (array_size_threshold, "array_size_threshold": u64, 512_000), /// Lint: VEC_BOX. The size of the boxed type in bytes, where boxing in a `Vec` is allowed (vec_box_size_threshold, "vec_box_size_threshold": u64, 4096), + /// Lint: TYPE_REPETITION_IN_BOUNDS. The maximum number of bounds a trait can have to be linted + (max_trait_bounds, "max_trait_bounds": u64, 3), /// Lint: STRUCT_EXCESSIVE_BOOLS. The maximum number of bools a struct can have (max_struct_bools, "max_struct_bools": u64, 3), /// Lint: FN_PARAMS_EXCESSIVE_BOOLS. The maximum number of bools function parameters can have diff --git a/src/tools/clippy/clippy_lints/src/utils/hir_utils.rs b/src/tools/clippy/clippy_lints/src/utils/hir_utils.rs index ae58f0a1521..34341594c19 100644 --- a/src/tools/clippy/clippy_lints/src/utils/hir_utils.rs +++ b/src/tools/clippy/clippy_lints/src/utils/hir_utils.rs @@ -703,6 +703,7 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> { } for segment in path.segments { segment.ident.name.hash(&mut self.s); + self.hash_generic_args(segment.generic_args().args); } }, QPath::TypeRelative(ref ty, ref segment) => { @@ -711,13 +712,7 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> { }, }, TyKind::OpaqueDef(_, arg_list) => { - for arg in *arg_list { - match arg { - GenericArg::Lifetime(ref l) => self.hash_lifetime(l), - GenericArg::Type(ref ty) => self.hash_ty(&ty), - GenericArg::Const(ref ca) => self.hash_body(ca.value.body), - } - } + self.hash_generic_args(arg_list); }, TyKind::TraitObject(_, lifetime) => { self.hash_lifetime(lifetime); @@ -735,4 +730,14 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> { self.hash_expr(&self.cx.tcx.hir().body(body_id).value); self.maybe_typeck_tables = old_maybe_typeck_tables; } + + fn hash_generic_args(&mut self, arg_list: &[GenericArg<'_>]) { + for arg in arg_list { + match arg { + GenericArg::Lifetime(ref l) => self.hash_lifetime(l), + GenericArg::Type(ref ty) => self.hash_ty(&ty), + GenericArg::Const(ref ca) => self.hash_body(ca.value.body), + } + } + } } diff --git a/src/tools/clippy/clippy_lints/src/utils/mod.rs b/src/tools/clippy/clippy_lints/src/utils/mod.rs index 99ba7d64331..4b7a1c2b537 100644 --- a/src/tools/clippy/clippy_lints/src/utils/mod.rs +++ b/src/tools/clippy/clippy_lints/src/utils/mod.rs @@ -102,11 +102,7 @@ pub fn in_constant(cx: &LateContext<'_>, id: HirId) -> bool { #[must_use] pub fn in_macro(span: Span) -> bool { if span.from_expansion() { - if let ExpnKind::Desugaring(..) = span.ctxt().outer_expn_data().kind { - false - } else { - true - } + !matches!(span.ctxt().outer_expn_data().kind, ExpnKind::Desugaring(..)) } else { false } @@ -127,10 +123,7 @@ pub fn is_present_in_source<T: LintContext>(cx: &T, span: Span) -> bool { /// Checks if given pattern is a wildcard (`_`) pub fn is_wild<'tcx>(pat: &impl std::ops::Deref<Target = Pat<'tcx>>) -> bool { - match pat.kind { - PatKind::Wild => true, - _ => false, - } + matches!(pat.kind, PatKind::Wild) } /// Checks if type is struct, enum or union type with the given def path. @@ -153,11 +146,7 @@ pub fn is_type_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symb pub fn match_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, path: &[&str]) -> bool { let def_id = cx.tables().type_dependent_def_id(expr.hir_id).unwrap(); let trt_id = cx.tcx.trait_of_item(def_id); - if let Some(trt_id) = trt_id { - match_def_path(cx, trt_id, path) - } else { - false - } + trt_id.map_or(false, |trt_id| match_def_path(cx, trt_id, path)) } /// Checks if an expression references a variable of the given name. @@ -600,21 +589,15 @@ pub fn snippet_block_with_applicability<'a, T: LintContext>( /// // ^^^^^^^^^^ /// ``` pub fn first_line_of_span<T: LintContext>(cx: &T, span: Span) -> Span { - if let Some(first_char_pos) = first_char_in_first_line(cx, span) { - span.with_lo(first_char_pos) - } else { - span - } + first_char_in_first_line(cx, span).map_or(span, |first_char_pos| span.with_lo(first_char_pos)) } fn first_char_in_first_line<T: LintContext>(cx: &T, span: Span) -> Option<BytePos> { let line_span = line_span(cx, span); - if let Some(snip) = snippet_opt(cx, line_span) { + snippet_opt(cx, line_span).and_then(|snip| { snip.find(|c: char| !c.is_whitespace()) .map(|pos| line_span.lo() + BytePos::from_usize(pos)) - } else { - None - } + }) } /// Returns the indentation of the line of a span @@ -626,11 +609,7 @@ fn first_char_in_first_line<T: LintContext>(cx: &T, span: Span) -> Option<BytePo /// // ^^ -- will return 4 /// ``` pub fn indent_of<T: LintContext>(cx: &T, span: Span) -> Option<usize> { - if let Some(snip) = snippet_opt(cx, line_span(cx, span)) { - snip.find(|c: char| !c.is_whitespace()) - } else { - None - } + snippet_opt(cx, line_span(cx, span)).and_then(|snip| snip.find(|c: char| !c.is_whitespace())) } /// Extends the span to the beginning of the spans line, incl. whitespaces. @@ -738,25 +717,21 @@ pub fn get_enclosing_block<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Optio let enclosing_node = map .get_enclosing_scope(hir_id) .and_then(|enclosing_id| map.find(enclosing_id)); - if let Some(node) = enclosing_node { - match node { - Node::Block(block) => Some(block), - Node::Item(&Item { - kind: ItemKind::Fn(_, _, eid), - .. - }) - | Node::ImplItem(&ImplItem { - kind: ImplItemKind::Fn(_, eid), - .. - }) => match cx.tcx.hir().body(eid).value.kind { - ExprKind::Block(ref block, _) => Some(block), - _ => None, - }, + enclosing_node.and_then(|node| match node { + Node::Block(block) => Some(block), + Node::Item(&Item { + kind: ItemKind::Fn(_, _, eid), + .. + }) + | Node::ImplItem(&ImplItem { + kind: ImplItemKind::Fn(_, eid), + .. + }) => match cx.tcx.hir().body(eid).value.kind { + ExprKind::Block(ref block, _) => Some(block), _ => None, - } - } else { - None - } + }, + _ => None, + }) } /// Returns the base type for HIR references and pointers. @@ -1328,11 +1303,7 @@ pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { _ => None, }; - if let Some(did) = did { - must_use_attr(&cx.tcx.get_attrs(did)).is_some() - } else { - false - } + did.map_or(false, |did| must_use_attr(&cx.tcx.get_attrs(did)).is_some()) } pub fn is_no_std_crate(krate: &Crate<'_>) -> bool { @@ -1385,6 +1356,21 @@ pub fn fn_has_unsatisfiable_preds(cx: &LateContext<'_>, did: DefId) -> bool { ) } +/// Returns the `DefId` of the callee if the given expression is a function or method call. +pub fn fn_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<DefId> { + match &expr.kind { + ExprKind::MethodCall(..) => cx.tables().type_dependent_def_id(expr.hir_id), + ExprKind::Call( + Expr { + kind: ExprKind::Path(qpath), + .. + }, + .., + ) => cx.tables().qpath_res(qpath, expr.hir_id).opt_def_id(), + _ => None, + } +} + pub fn run_lints(cx: &LateContext<'_>, lints: &[&'static Lint], id: HirId) -> bool { lints.iter().any(|lint| { matches!( diff --git a/src/tools/clippy/clippy_lints/src/utils/numeric_literal.rs b/src/tools/clippy/clippy_lints/src/utils/numeric_literal.rs index 99413153d49..87cb454f654 100644 --- a/src/tools/clippy/clippy_lints/src/utils/numeric_literal.rs +++ b/src/tools/clippy/clippy_lints/src/utils/numeric_literal.rs @@ -51,7 +51,7 @@ impl<'a> NumericLiteral<'a> { pub fn from_lit_kind(src: &'a str, lit_kind: &LitKind) -> Option<NumericLiteral<'a>> { if lit_kind.is_numeric() && src.chars().next().map_or(false, |c| c.is_digit(10)) { let (unsuffixed, suffix) = split_suffix(&src, lit_kind); - let float = if let LitKind::Float(..) = lit_kind { true } else { false }; + let float = matches!(lit_kind, LitKind::Float(..)); Some(NumericLiteral::new(unsuffixed, suffix, float)) } else { None @@ -200,12 +200,10 @@ impl<'a> NumericLiteral<'a> { fn split_suffix<'a>(src: &'a str, lit_kind: &LitKind) -> (&'a str, Option<&'a str>) { debug_assert!(lit_kind.is_numeric()); - if let Some(suffix_length) = lit_suffix_length(lit_kind) { + lit_suffix_length(lit_kind).map_or((src, None), |suffix_length| { let (unsuffixed, suffix) = src.split_at(src.len() - suffix_length); (unsuffixed, Some(suffix)) - } else { - (src, None) - } + }) } fn lit_suffix_length(lit_kind: &LitKind) -> Option<usize> { diff --git a/src/tools/clippy/clippy_lints/src/utils/paths.rs b/src/tools/clippy/clippy_lints/src/utils/paths.rs index 3b7e9739211..4c3462802e9 100644 --- a/src/tools/clippy/clippy_lints/src/utils/paths.rs +++ b/src/tools/clippy/clippy_lints/src/utils/paths.rs @@ -98,7 +98,6 @@ pub const RANGE_TO_STD: [&str; 3] = ["std", "ops", "RangeTo"]; pub const RC: [&str; 3] = ["alloc", "rc", "Rc"]; pub const RC_PTR_EQ: [&str; 4] = ["alloc", "rc", "Rc", "ptr_eq"]; pub const RECEIVER: [&str; 4] = ["std", "sync", "mpsc", "Receiver"]; -pub const REGEX: [&str; 3] = ["regex", "re_unicode", "Regex"]; pub const REGEX_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "unicode", "RegexBuilder", "new"]; pub const REGEX_BYTES_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "bytes", "RegexBuilder", "new"]; pub const REGEX_BYTES_NEW: [&str; 4] = ["regex", "re_bytes", "Regex", "new"]; diff --git a/src/tools/clippy/clippy_lints/src/utils/sugg.rs b/src/tools/clippy/clippy_lints/src/utils/sugg.rs index d05e81b9505..0ac7714fbeb 100644 --- a/src/tools/clippy/clippy_lints/src/utils/sugg.rs +++ b/src/tools/clippy/clippy_lints/src/utils/sugg.rs @@ -325,22 +325,22 @@ pub fn make_unop(op: &str, expr: Sugg<'_>) -> Sugg<'static> { /// parenthesis will always be added for a mix of these. pub fn make_assoc(op: AssocOp, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> { /// Returns `true` if the operator is a shift operator `<<` or `>>`. - fn is_shift(op: &AssocOp) -> bool { - matches!(*op, AssocOp::ShiftLeft | AssocOp::ShiftRight) + fn is_shift(op: AssocOp) -> bool { + matches!(op, AssocOp::ShiftLeft | AssocOp::ShiftRight) } /// Returns `true` if the operator is a arithmetic operator /// (i.e., `+`, `-`, `*`, `/`, `%`). - fn is_arith(op: &AssocOp) -> bool { + fn is_arith(op: AssocOp) -> bool { matches!( - *op, + op, AssocOp::Add | AssocOp::Subtract | AssocOp::Multiply | AssocOp::Divide | AssocOp::Modulus ) } /// Returns `true` if the operator `op` needs parenthesis with the operator /// `other` in the direction `dir`. - fn needs_paren(op: &AssocOp, other: &AssocOp, dir: Associativity) -> bool { + fn needs_paren(op: AssocOp, other: AssocOp, dir: Associativity) -> bool { other.precedence() < op.precedence() || (other.precedence() == op.precedence() && ((op != other && associativity(op) != dir) @@ -349,14 +349,14 @@ pub fn make_assoc(op: AssocOp, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> || is_shift(other) && is_arith(op) } - let lhs_paren = if let Sugg::BinOp(ref lop, _) = *lhs { - needs_paren(&op, lop, Associativity::Left) + let lhs_paren = if let Sugg::BinOp(lop, _) = *lhs { + needs_paren(op, lop, Associativity::Left) } else { false }; - let rhs_paren = if let Sugg::BinOp(ref rop, _) = *rhs { - needs_paren(&op, rop, Associativity::Right) + let rhs_paren = if let Sugg::BinOp(rop, _) = *rhs { + needs_paren(op, rop, Associativity::Right) } else { false }; @@ -424,13 +424,13 @@ enum Associativity { /// they are considered /// associative. #[must_use] -fn associativity(op: &AssocOp) -> Associativity { +fn associativity(op: AssocOp) -> Associativity { use rustc_ast::util::parser::AssocOp::{ Add, As, Assign, AssignOp, BitAnd, BitOr, BitXor, Colon, Divide, DotDot, DotDotEq, Equal, Greater, GreaterEqual, LAnd, LOr, Less, LessEqual, Modulus, Multiply, NotEqual, ShiftLeft, ShiftRight, Subtract, }; - match *op { + match op { Assign | AssignOp(_) => Associativity::Right, Add | BitAnd | BitOr | BitXor | LAnd | LOr | Multiply | As | Colon => Associativity::Both, Divide | Equal | Greater | GreaterEqual | Less | LessEqual | Modulus | NotEqual | ShiftLeft | ShiftRight @@ -492,20 +492,20 @@ fn astbinop2assignop(op: ast::BinOp) -> AssocOp { /// before it on its line. fn indentation<T: LintContext>(cx: &T, span: Span) -> Option<String> { let lo = cx.sess().source_map().lookup_char_pos(span.lo()); - if let Some(line) = lo.file.get_line(lo.line - 1 /* line numbers in `Loc` are 1-based */) { - if let Some((pos, _)) = line.char_indices().find(|&(_, c)| c != ' ' && c != '\t') { - // We can mix char and byte positions here because we only consider `[ \t]`. - if lo.col == CharPos(pos) { - Some(line[..pos].into()) + lo.file + .get_line(lo.line - 1 /* line numbers in `Loc` are 1-based */) + .and_then(|line| { + if let Some((pos, _)) = line.char_indices().find(|&(_, c)| c != ' ' && c != '\t') { + // We can mix char and byte positions here because we only consider `[ \t]`. + if lo.col == CharPos(pos) { + Some(line[..pos].into()) + } else { + None + } } else { None } - } else { - None - } - } else { - None - } + }) } /// Convenience extension trait for `DiagnosticBuilder`. diff --git a/src/tools/clippy/clippy_lints/src/write.rs b/src/tools/clippy/clippy_lints/src/write.rs index cb769b5a2ce..063f94582b9 100644 --- a/src/tools/clippy/clippy_lints/src/write.rs +++ b/src/tools/clippy/clippy_lints/src/write.rs @@ -23,7 +23,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// println!(""); + /// + /// // Good + /// println!(); /// ``` pub PRINTLN_EMPTY_STRING, style, @@ -32,8 +36,7 @@ declare_clippy_lint! { declare_clippy_lint! { /// **What it does:** This lint warns when you use `print!()` with a format - /// string that - /// ends in a newline. + /// string that ends in a newline. /// /// **Why is this bad?** You should use `println!()` instead, which appends the /// newline. @@ -125,7 +128,12 @@ declare_clippy_lint! { /// ```rust /// # use std::fmt::Write; /// # let mut buf = String::new(); + /// + /// // Bad /// writeln!(buf, ""); + /// + /// // Good + /// writeln!(buf); /// ``` pub WRITELN_EMPTY_STRING, style, @@ -147,7 +155,12 @@ declare_clippy_lint! { /// # use std::fmt::Write; /// # let mut buf = String::new(); /// # let name = "World"; + /// + /// // Bad /// write!(buf, "Hello {}!\n", name); + /// + /// // Good + /// writeln!(buf, "Hello {}!", name); /// ``` pub WRITE_WITH_NEWLINE, style, @@ -168,7 +181,12 @@ declare_clippy_lint! { /// ```rust /// # use std::fmt::Write; /// # let mut buf = String::new(); + /// + /// // Bad /// writeln!(buf, "{}", "foo"); + /// + /// // Good + /// writeln!(buf, "foo"); /// ``` pub WRITE_LITERAL, style, @@ -279,13 +297,13 @@ impl EarlyLintPass for Write { if let (Some(fmt_str), expr) = self.check_tts(cx, &mac.args.inner_tokens(), true) { if fmt_str.symbol == Symbol::intern("") { let mut applicability = Applicability::MachineApplicable; - let suggestion = match expr { - Some(expr) => snippet_with_applicability(cx, expr.span, "v", &mut applicability), - None => { + let suggestion = expr.map_or_else( + || { applicability = Applicability::HasPlaceholders; Cow::Borrowed("v") }, - }; + |e| snippet_with_applicability(cx, e.span, "v", &mut Applicability::MachineApplicable), + ); span_lint_and_sugg( cx, diff --git a/src/tools/clippy/src/driver.rs b/src/tools/clippy/src/driver.rs index decd3a79cce..47315fa64cd 100644 --- a/src/tools/clippy/src/driver.rs +++ b/src/tools/clippy/src/driver.rs @@ -382,13 +382,8 @@ pub fn main() { let should_describe_lints = || { let args: Vec<_> = env::args().collect(); - args.windows(2).any(|args| { - args[1] == "help" - && match args[0].as_str() { - "-W" | "-A" | "-D" | "-F" => true, - _ => false, - } - }) + args.windows(2) + .any(|args| args[1] == "help" && matches!(args[0].as_str(), "-W" | "-A" | "-D" | "-F")) }; if !wrapper_mode && should_describe_lints() { diff --git a/src/tools/clippy/src/lintlist/mod.rs b/src/tools/clippy/src/lintlist/mod.rs index edceb755180..b89a8712862 100644 --- a/src/tools/clippy/src/lintlist/mod.rs +++ b/src/tools/clippy/src/lintlist/mod.rs @@ -81,6 +81,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ module: "blacklisted_name", }, Lint { + name: "blanket_clippy_restriction_lints", + group: "style", + desc: "enabling the complete restriction group", + deprecation: None, + module: "attrs", + }, + Lint { name: "blocks_in_if_conditions", group: "style", desc: "useless or complex blocks that can be eliminated in conditions", @@ -1145,6 +1152,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ module: "methods", }, Lint { + name: "map_identity", + group: "complexity", + desc: "using iterator.map(|x| x)", + deprecation: None, + module: "map_identity", + }, + Lint { name: "map_unwrap_or", group: "pedantic", desc: "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`", @@ -1166,6 +1180,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ module: "matches", }, Lint { + name: "match_like_matches_macro", + group: "style", + desc: "a match that could be written with the matches! macro", + deprecation: None, + module: "matches", + }, + Lint { name: "match_on_vec_items", group: "pedantic", desc: "matching on vector elements can panic", @@ -1607,6 +1628,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ module: "option_env_unwrap", }, Lint { + name: "option_if_let_else", + group: "pedantic", + desc: "reimplementation of Option::map_or", + deprecation: None, + module: "option_if_let_else", + }, + Lint { name: "option_map_or_none", group: "style", desc: "using `Option.map_or(None, f)`, which is more succinctly expressed as `and_then(f)`", @@ -1684,6 +1712,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ module: "path_buf_push_overwrite", }, Lint { + name: "pattern_type_mismatch", + group: "restriction", + desc: "type of pattern does not match the expression type", + deprecation: None, + module: "pattern_type_mismatch", + }, + Lint { name: "possible_missing_comma", group: "correctness", desc: "possible missing comma in array", @@ -1755,7 +1790,7 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ }, Lint { name: "range_minus_one", - group: "complexity", + group: "pedantic", desc: "`x..=(y-1)` reads better as `x..y`", deprecation: None, module: "ranges", @@ -1828,7 +1863,7 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ group: "style", desc: "use the proper utility function avoiding an `if let`", deprecation: None, - module: "redundant_pattern_matching", + module: "matches", }, Lint { name: "redundant_pub_crate", @@ -1852,11 +1887,11 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![ module: "reference", }, Lint { - name: "regex_macro", - group: "style", - desc: "use of `regex!(_)` instead of `Regex::new(_)`", + name: "repeat_once", + group: "complexity", + desc: "using `.repeat(1)` instead of `String.clone()`, `str.to_string()` or `slice.to_vec()` ", deprecation: None, - module: "regex", + module: "repeat_once", }, Lint { name: "rest_pat_in_fully_bound_structs", diff --git a/src/tools/clippy/tests/compile-test.rs b/src/tools/clippy/tests/compile-test.rs index 368fa6a98c5..26a47d23706 100644 --- a/src/tools/clippy/tests/compile-test.rs +++ b/src/tools/clippy/tests/compile-test.rs @@ -12,19 +12,11 @@ use std::path::{Path, PathBuf}; mod cargo; fn host_lib() -> PathBuf { - if let Some(path) = option_env!("HOST_LIBS") { - PathBuf::from(path) - } else { - cargo::CARGO_TARGET_DIR.join(env!("PROFILE")) - } + option_env!("HOST_LIBS").map_or(cargo::CARGO_TARGET_DIR.join(env!("PROFILE")), PathBuf::from) } fn clippy_driver_path() -> PathBuf { - if let Some(path) = option_env!("CLIPPY_DRIVER_PATH") { - PathBuf::from(path) - } else { - cargo::TARGET_LIB.join("clippy-driver") - } + option_env!("CLIPPY_DRIVER_PATH").map_or(cargo::TARGET_LIB.join("clippy-driver"), PathBuf::from) } // When we'll want to use `extern crate ..` 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+checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc" + +[[package]] +name = "winapi-i686-pc-windows-gnu" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6" + +[[package]] +name = "winapi-x86_64-pc-windows-gnu" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" diff --git a/src/tools/clippy/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr b/src/tools/clippy/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr index 4f668599be9..f3113e09365 100644 --- a/src/tools/clippy/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr +++ b/src/tools/clippy/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr @@ -1,4 +1,4 @@ -error: multiple versions for dependency `winapi`: 0.2.8, 0.3.8 +error: multiple versions for dependency `winapi`: 0.2.8, 0.3.9 | = note: `-D clippy::multiple-crate-versions` implied by `-D warnings` diff --git a/src/tools/clippy/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr b/src/tools/clippy/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr index 53970af4107..6fbba01416a 100644 --- a/src/tools/clippy/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr +++ b/src/tools/clippy/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr @@ -1,4 +1,4 @@ -error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown field `foobar`, expected one of `blacklisted-names`, `cognitive-complexity-threshold`, `cyclomatic-complexity-threshold`, `doc-valid-idents`, `too-many-arguments-threshold`, `type-complexity-threshold`, `single-char-binding-names-threshold`, `too-large-for-stack`, `enum-variant-name-threshold`, `enum-variant-size-threshold`, `verbose-bit-mask-threshold`, `literal-representation-threshold`, `trivial-copy-size-limit`, `too-many-lines-threshold`, `array-size-threshold`, `vec-box-size-threshold`, `max-struct-bools`, `max-fn-params-bools`, `warn-on-all-wildcard-imports`, `third-party` at line 5 column 1 +error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown field `foobar`, expected one of `blacklisted-names`, `cognitive-complexity-threshold`, `cyclomatic-complexity-threshold`, `doc-valid-idents`, `too-many-arguments-threshold`, `type-complexity-threshold`, `single-char-binding-names-threshold`, `too-large-for-stack`, `enum-variant-name-threshold`, `enum-variant-size-threshold`, `verbose-bit-mask-threshold`, `literal-representation-threshold`, `trivial-copy-size-limit`, `too-many-lines-threshold`, `array-size-threshold`, `vec-box-size-threshold`, `max-trait-bounds`, `max-struct-bools`, `max-fn-params-bools`, `warn-on-all-wildcard-imports`, `third-party` at line 5 column 1 error: aborting due to previous error diff --git a/src/tools/clippy/tests/ui/attrs.rs b/src/tools/clippy/tests/ui/attrs.rs index 91b65a43be7..908d063729f 100644 --- a/src/tools/clippy/tests/ui/attrs.rs +++ b/src/tools/clippy/tests/ui/attrs.rs @@ -1,5 +1,11 @@ #![warn(clippy::inline_always, clippy::deprecated_semver)] #![allow(clippy::assertions_on_constants)] +// Test that the whole restriction group is not enabled +#![warn(clippy::restriction)] +#![deny(clippy::restriction)] +#![forbid(clippy::restriction)] +#![allow(clippy::missing_docs_in_private_items, clippy::panic, clippy::unreachable)] + #[inline(always)] fn test_attr_lint() { assert!(true) diff --git a/src/tools/clippy/tests/ui/attrs.stderr b/src/tools/clippy/tests/ui/attrs.stderr index 39ddf6f226d..ef4b89eaa6d 100644 --- a/src/tools/clippy/tests/ui/attrs.stderr +++ b/src/tools/clippy/tests/ui/attrs.stderr @@ -1,5 +1,5 @@ error: you have declared `#[inline(always)]` on `test_attr_lint`. This is usually a bad idea - --> $DIR/attrs.rs:3:1 + --> $DIR/attrs.rs:9:1 | LL | #[inline(always)] | ^^^^^^^^^^^^^^^^^ @@ -7,7 +7,7 @@ LL | #[inline(always)] = note: `-D clippy::inline-always` implied by `-D warnings` error: the since field must contain a semver-compliant version - --> $DIR/attrs.rs:23:14 + --> $DIR/attrs.rs:29:14 | LL | #[deprecated(since = "forever")] | ^^^^^^^^^^^^^^^^^ @@ -15,10 +15,35 @@ LL | #[deprecated(since = "forever")] = note: `-D clippy::deprecated-semver` implied by `-D warnings` error: the since field must contain a semver-compliant version - --> $DIR/attrs.rs:26:14 + --> $DIR/attrs.rs:32:14 | LL | #[deprecated(since = "1")] | ^^^^^^^^^^^ -error: aborting due to 3 previous errors +error: restriction lints are not meant to be all enabled + --> $DIR/attrs.rs:4:9 + | +LL | #![warn(clippy::restriction)] + | ^^^^^^^^^^^^^^^^^^^ + | + = note: `-D clippy::blanket-clippy-restriction-lints` implied by `-D warnings` + = help: try enabling only the lints you really need + +error: restriction lints are not meant to be all enabled + --> $DIR/attrs.rs:5:9 + | +LL | #![deny(clippy::restriction)] + | ^^^^^^^^^^^^^^^^^^^ + | + = help: try enabling only the lints you really need + +error: restriction lints are not meant to be all enabled + --> $DIR/attrs.rs:6:11 + | +LL | #![forbid(clippy::restriction)] + | ^^^^^^^^^^^^^^^^^^^ + | + = help: try enabling only the lints you really need + +error: aborting due to 6 previous errors diff --git a/src/tools/clippy/tests/ui/clone_on_copy.fixed b/src/tools/clippy/tests/ui/clone_on_copy.fixed new file mode 100644 index 00000000000..1f0ca101757 --- /dev/null +++ b/src/tools/clippy/tests/ui/clone_on_copy.fixed @@ -0,0 +1,40 @@ +// run-rustfix + +#![allow( + unused, + clippy::redundant_clone, + clippy::deref_addrof, + clippy::no_effect, + clippy::unnecessary_operation +)] + +use std::cell::RefCell; +use std::rc::{self, Rc}; +use std::sync::{self, Arc}; + +fn main() {} + +fn is_ascii(ch: char) -> bool { + ch.is_ascii() +} + +fn clone_on_copy() { + 42; + + vec![1].clone(); // ok, not a Copy type + Some(vec![1]).clone(); // ok, not a Copy type + *(&42); + + let rc = RefCell::new(0); + *rc.borrow(); + + // Issue #4348 + let mut x = 43; + let _ = &x.clone(); // ok, getting a ref + 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate + is_ascii('z'); + + // Issue #5436 + let mut vec = Vec::new(); + vec.push(42); +} diff --git a/src/tools/clippy/tests/ui/clone_on_copy.rs b/src/tools/clippy/tests/ui/clone_on_copy.rs new file mode 100644 index 00000000000..ca39a654b4f --- /dev/null +++ b/src/tools/clippy/tests/ui/clone_on_copy.rs @@ -0,0 +1,40 @@ +// run-rustfix + +#![allow( + unused, + clippy::redundant_clone, + clippy::deref_addrof, + clippy::no_effect, + clippy::unnecessary_operation +)] + +use std::cell::RefCell; +use std::rc::{self, Rc}; +use std::sync::{self, Arc}; + +fn main() {} + +fn is_ascii(ch: char) -> bool { + ch.is_ascii() +} + +fn clone_on_copy() { + 42.clone(); + + vec![1].clone(); // ok, not a Copy type + Some(vec![1]).clone(); // ok, not a Copy type + (&42).clone(); + + let rc = RefCell::new(0); + rc.borrow().clone(); + + // Issue #4348 + let mut x = 43; + let _ = &x.clone(); // ok, getting a ref + 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate + is_ascii('z'.clone()); + + // Issue #5436 + let mut vec = Vec::new(); + vec.push(42.clone()); +} diff --git a/src/tools/clippy/tests/ui/clone_on_copy.stderr b/src/tools/clippy/tests/ui/clone_on_copy.stderr new file mode 100644 index 00000000000..ec2faf4ab40 --- /dev/null +++ b/src/tools/clippy/tests/ui/clone_on_copy.stderr @@ -0,0 +1,34 @@ +error: using `clone` on a `Copy` type + --> $DIR/clone_on_copy.rs:22:5 + | +LL | 42.clone(); + | ^^^^^^^^^^ help: try removing the `clone` call: `42` + | + = note: `-D clippy::clone-on-copy` implied by `-D warnings` + +error: using `clone` on a `Copy` type + --> $DIR/clone_on_copy.rs:26:5 + | +LL | (&42).clone(); + | ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)` + +error: using `clone` on a `Copy` type + --> $DIR/clone_on_copy.rs:29:5 + | +LL | rc.borrow().clone(); + | ^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*rc.borrow()` + +error: using `clone` on a `Copy` type + --> $DIR/clone_on_copy.rs:35:14 + | +LL | is_ascii('z'.clone()); + | ^^^^^^^^^^^ help: try removing the `clone` call: `'z'` + +error: using `clone` on a `Copy` type + --> $DIR/clone_on_copy.rs:39:14 + | +LL | vec.push(42.clone()); + | ^^^^^^^^^^ help: try removing the `clone` call: `42` + +error: aborting due to 5 previous errors + diff --git a/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.fixed b/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.fixed new file mode 100644 index 00000000000..3305ac9bf8b --- /dev/null +++ b/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.fixed @@ -0,0 +1,93 @@ +// run-rustfix +#![allow(unused, clippy::redundant_clone)] // See #5700 + +// Define the types in each module to avoid trait impls leaking between modules. +macro_rules! impl_types { + () => { + #[derive(PartialEq)] + pub struct Owned; + + pub struct Borrowed; + + impl ToOwned for Borrowed { + type Owned = Owned; + fn to_owned(&self) -> Owned { + Owned {} + } + } + + impl std::borrow::Borrow<Borrowed> for Owned { + fn borrow(&self) -> &Borrowed { + static VALUE: Borrowed = Borrowed {}; + &VALUE + } + } + }; +} + +// Only Borrowed == Owned is implemented +mod borrowed_eq_owned { + impl_types!(); + + impl PartialEq<Owned> for Borrowed { + fn eq(&self, _: &Owned) -> bool { + true + } + } + + pub fn compare() { + let owned = Owned {}; + let borrowed = Borrowed {}; + + if borrowed == owned {} + if borrowed == owned {} + } +} + +// Only Owned == Borrowed is implemented +mod owned_eq_borrowed { + impl_types!(); + + impl PartialEq<Borrowed> for Owned { + fn eq(&self, _: &Borrowed) -> bool { + true + } + } + + fn compare() { + let owned = Owned {}; + let borrowed = Borrowed {}; + + if owned == borrowed {} + if owned == borrowed {} + } +} + +mod issue_4874 { + impl_types!(); + + // NOTE: PartialEq<Borrowed> for T can't be implemented due to the orphan rules + impl<T> PartialEq<T> for Borrowed + where + T: AsRef<str> + ?Sized, + { + fn eq(&self, _: &T) -> bool { + true + } + } + + impl std::fmt::Display for Borrowed { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + write!(f, "borrowed") + } + } + + fn compare() { + let borrowed = Borrowed {}; + + if borrowed == "Hi" {} + if borrowed == "Hi" {} + } +} + +fn main() {} diff --git a/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.rs b/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.rs new file mode 100644 index 00000000000..88bc2f51dd6 --- /dev/null +++ b/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.rs @@ -0,0 +1,93 @@ +// run-rustfix +#![allow(unused, clippy::redundant_clone)] // See #5700 + +// Define the types in each module to avoid trait impls leaking between modules. +macro_rules! impl_types { + () => { + #[derive(PartialEq)] + pub struct Owned; + + pub struct Borrowed; + + impl ToOwned for Borrowed { + type Owned = Owned; + fn to_owned(&self) -> Owned { + Owned {} + } + } + + impl std::borrow::Borrow<Borrowed> for Owned { + fn borrow(&self) -> &Borrowed { + static VALUE: Borrowed = Borrowed {}; + &VALUE + } + } + }; +} + +// Only Borrowed == Owned is implemented +mod borrowed_eq_owned { + impl_types!(); + + impl PartialEq<Owned> for Borrowed { + fn eq(&self, _: &Owned) -> bool { + true + } + } + + pub fn compare() { + let owned = Owned {}; + let borrowed = Borrowed {}; + + if borrowed.to_owned() == owned {} + if owned == borrowed.to_owned() {} + } +} + +// Only Owned == Borrowed is implemented +mod owned_eq_borrowed { + impl_types!(); + + impl PartialEq<Borrowed> for Owned { + fn eq(&self, _: &Borrowed) -> bool { + true + } + } + + fn compare() { + let owned = Owned {}; + let borrowed = Borrowed {}; + + if owned == borrowed.to_owned() {} + if borrowed.to_owned() == owned {} + } +} + +mod issue_4874 { + impl_types!(); + + // NOTE: PartialEq<Borrowed> for T can't be implemented due to the orphan rules + impl<T> PartialEq<T> for Borrowed + where + T: AsRef<str> + ?Sized, + { + fn eq(&self, _: &T) -> bool { + true + } + } + + impl std::fmt::Display for Borrowed { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + write!(f, "borrowed") + } + } + + fn compare() { + let borrowed = Borrowed {}; + + if "Hi" == borrowed.to_string() {} + if borrowed.to_string() == "Hi" {} + } +} + +fn main() {} diff --git a/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.stderr b/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.stderr new file mode 100644 index 00000000000..43bf8851fc6 --- /dev/null +++ b/src/tools/clippy/tests/ui/cmp_owned/asymmetric_partial_eq.stderr @@ -0,0 +1,46 @@ +error: this creates an owned instance just for comparison + --> $DIR/asymmetric_partial_eq.rs:42:12 + | +LL | if borrowed.to_owned() == owned {} + | ^^^^^^^^^^^^^^^^^^^ help: try: `borrowed` + | + = note: `-D clippy::cmp-owned` implied by `-D warnings` + +error: this creates an owned instance just for comparison + --> $DIR/asymmetric_partial_eq.rs:43:21 + | +LL | if owned == borrowed.to_owned() {} + | ---------^^^^^^^^^^^^^^^^^^^ + | | + | help: try: `borrowed == owned` + +error: this creates an owned instance just for comparison + --> $DIR/asymmetric_partial_eq.rs:61:21 + | +LL | if owned == borrowed.to_owned() {} + | ^^^^^^^^^^^^^^^^^^^ help: try: `borrowed` + +error: this creates an owned instance just for comparison + --> $DIR/asymmetric_partial_eq.rs:62:12 + | +LL | if borrowed.to_owned() == owned {} + | ^^^^^^^^^^^^^^^^^^^--------- + | | + | help: try: `owned == borrowed` + +error: this creates an owned instance just for comparison + --> $DIR/asymmetric_partial_eq.rs:88:20 + | +LL | if "Hi" == borrowed.to_string() {} + | --------^^^^^^^^^^^^^^^^^^^^ + | | + | help: try: `borrowed == "Hi"` + +error: this creates an owned instance just for comparison + --> $DIR/asymmetric_partial_eq.rs:89:12 + | +LL | if borrowed.to_string() == "Hi" {} + | ^^^^^^^^^^^^^^^^^^^^ help: try: `borrowed` + +error: aborting due to 6 previous errors + diff --git a/src/tools/clippy/tests/ui/collapsible_else_if.stderr b/src/tools/clippy/tests/ui/collapsible_else_if.stderr index 28048999e8e..3d1c458879e 100644 --- a/src/tools/clippy/tests/ui/collapsible_else_if.stderr +++ b/src/tools/clippy/tests/ui/collapsible_else_if.stderr @@ -10,7 +10,7 @@ LL | | } | |_____^ | = note: `-D clippy::collapsible-if` implied by `-D warnings` -help: try +help: collapse nested if block | LL | } else if y == "world" { LL | println!("world!") @@ -28,7 +28,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | } else if let Some(42) = Some(42) { LL | println!("world!") @@ -48,7 +48,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | } else if y == "world" { LL | println!("world") @@ -71,7 +71,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | } else if let Some(42) = Some(42) { LL | println!("world") @@ -94,7 +94,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | } else if let Some(42) = Some(42) { LL | println!("world") @@ -117,7 +117,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | } else if x == "hello" { LL | println!("world") @@ -140,7 +140,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | } else if let Some(42) = Some(42) { LL | println!("world") diff --git a/src/tools/clippy/tests/ui/collapsible_if.stderr b/src/tools/clippy/tests/ui/collapsible_if.stderr index 6440ff41be8..f56dd65b9dd 100644 --- a/src/tools/clippy/tests/ui/collapsible_if.stderr +++ b/src/tools/clippy/tests/ui/collapsible_if.stderr @@ -9,7 +9,7 @@ LL | | } | |_____^ | = note: `-D clippy::collapsible-if` implied by `-D warnings` -help: try +help: collapse nested if block | LL | if x == "hello" && y == "world" { LL | println!("Hello world!"); @@ -26,7 +26,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | if (x == "hello" || x == "world") && (y == "world" || y == "hello") { LL | println!("Hello world!"); @@ -43,7 +43,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | if x == "hello" && x == "world" && (y == "world" || y == "hello") { LL | println!("Hello world!"); @@ -60,7 +60,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | if (x == "hello" || x == "world") && y == "world" && y == "hello" { LL | println!("Hello world!"); @@ -77,7 +77,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | if x == "hello" && x == "world" && y == "world" && y == "hello" { LL | println!("Hello world!"); @@ -94,7 +94,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | if 42 == 1337 && 'a' != 'A' { LL | println!("world!") @@ -111,7 +111,7 @@ LL | | } LL | | } | |_____^ | -help: try +help: collapse nested if block | LL | if x == "hello" && y == "world" { // Collapsible LL | println!("Hello world!"); diff --git a/src/tools/clippy/tests/ui/deprecated.rs b/src/tools/clippy/tests/ui/deprecated.rs index 188a641aa1a..3eefb232780 100644 --- a/src/tools/clippy/tests/ui/deprecated.rs +++ b/src/tools/clippy/tests/ui/deprecated.rs @@ -7,5 +7,6 @@ #[warn(clippy::invalid_ref)] #[warn(clippy::into_iter_on_array)] #[warn(clippy::unused_label)] +#[warn(clippy::regex_macro)] fn main() {} diff --git a/src/tools/clippy/tests/ui/deprecated.stderr b/src/tools/clippy/tests/ui/deprecated.stderr index a4efe3d15a9..a80e2bf31fe 100644 --- a/src/tools/clippy/tests/ui/deprecated.stderr +++ b/src/tools/clippy/tests/ui/deprecated.stderr @@ -54,11 +54,17 @@ error: lint `clippy::unused_label` has been removed: `this lint has been uplifte LL | #[warn(clippy::unused_label)] | ^^^^^^^^^^^^^^^^^^^^ +error: lint `clippy::regex_macro` has been removed: `the regex! macro has been removed from the regex crate in 2018` + --> $DIR/deprecated.rs:10:8 + | +LL | #[warn(clippy::regex_macro)] + | ^^^^^^^^^^^^^^^^^^^ + error: lint `clippy::str_to_string` has been removed: `using `str::to_string` is common even today and specialization will likely happen soon` --> $DIR/deprecated.rs:1:8 | LL | #[warn(clippy::str_to_string)] | ^^^^^^^^^^^^^^^^^^^^^ -error: aborting due to 10 previous errors +error: aborting due to 11 previous errors diff --git a/src/tools/clippy/tests/ui/find_map.rs b/src/tools/clippy/tests/ui/find_map.rs index c28cca144ca..88d3b0e7490 100644 --- a/src/tools/clippy/tests/ui/find_map.rs +++ b/src/tools/clippy/tests/ui/find_map.rs @@ -19,6 +19,7 @@ fn main() { let _: Option<i32> = a.iter().find(|s| s.parse::<i32>().is_ok()).map(|s| s.parse().unwrap()); + #[allow(clippy::match_like_matches_macro)] let _: Option<Flavor> = desserts_of_the_week .iter() .find(|dessert| match *dessert { diff --git a/src/tools/clippy/tests/ui/find_map.stderr b/src/tools/clippy/tests/ui/find_map.stderr index 92f40fe6f1f..f279850fef8 100644 --- a/src/tools/clippy/tests/ui/find_map.stderr +++ b/src/tools/clippy/tests/ui/find_map.stderr @@ -8,7 +8,7 @@ LL | let _: Option<i32> = a.iter().find(|s| s.parse::<i32>().is_ok()).map(|s = help: this is more succinctly expressed by calling `.find_map(..)` instead error: called `find(p).map(q)` on an `Iterator` - --> $DIR/find_map.rs:22:29 + --> $DIR/find_map.rs:23:29 | LL | let _: Option<Flavor> = desserts_of_the_week | _____________________________^ diff --git a/src/tools/clippy/tests/ui/floating_point_hypot.fixed b/src/tools/clippy/tests/ui/floating_point_hypot.fixed new file mode 100644 index 00000000000..bbe411b3f48 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_hypot.fixed @@ -0,0 +1,14 @@ +// run-rustfix +#![warn(clippy::imprecise_flops)] + +fn main() { + let x = 3f32; + let y = 4f32; + let _ = x.hypot(y); + let _ = (x + 1f32).hypot(y); + let _ = x.hypot(y); + // Cases where the lint shouldn't be applied + // TODO: linting this adds some complexity, but could be done + let _ = x.mul_add(x, y * y).sqrt(); + let _ = (x * 4f32 + y * y).sqrt(); +} diff --git a/src/tools/clippy/tests/ui/floating_point_hypot.rs b/src/tools/clippy/tests/ui/floating_point_hypot.rs new file mode 100644 index 00000000000..586fd170ea1 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_hypot.rs @@ -0,0 +1,14 @@ +// run-rustfix +#![warn(clippy::imprecise_flops)] + +fn main() { + let x = 3f32; + let y = 4f32; + let _ = (x * x + y * y).sqrt(); + let _ = ((x + 1f32) * (x + 1f32) + y * y).sqrt(); + let _ = (x.powi(2) + y.powi(2)).sqrt(); + // Cases where the lint shouldn't be applied + // TODO: linting this adds some complexity, but could be done + let _ = x.mul_add(x, y * y).sqrt(); + let _ = (x * 4f32 + y * y).sqrt(); +} diff --git a/src/tools/clippy/tests/ui/floating_point_hypot.stderr b/src/tools/clippy/tests/ui/floating_point_hypot.stderr new file mode 100644 index 00000000000..42069d9ee9e --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_hypot.stderr @@ -0,0 +1,22 @@ +error: hypotenuse can be computed more accurately + --> $DIR/floating_point_hypot.rs:7:13 + | +LL | let _ = (x * x + y * y).sqrt(); + | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.hypot(y)` + | + = note: `-D clippy::imprecise-flops` implied by `-D warnings` + +error: hypotenuse can be computed more accurately + --> $DIR/floating_point_hypot.rs:8:13 + | +LL | let _ = ((x + 1f32) * (x + 1f32) + y * y).sqrt(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(x + 1f32).hypot(y)` + +error: hypotenuse can be computed more accurately + --> $DIR/floating_point_hypot.rs:9:13 + | +LL | let _ = (x.powi(2) + y.powi(2)).sqrt(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.hypot(y)` + +error: aborting due to 3 previous errors + diff --git a/src/tools/clippy/tests/ui/floating_point_log.fixed b/src/tools/clippy/tests/ui/floating_point_log.fixed index 42c5e5d2bae..7dc7ee94aff 100644 --- a/src/tools/clippy/tests/ui/floating_point_log.fixed +++ b/src/tools/clippy/tests/ui/floating_point_log.fixed @@ -25,11 +25,11 @@ fn check_ln1p() { let _ = 2.0f32.ln_1p(); let _ = x.ln_1p(); let _ = (x / 2.0).ln_1p(); - let _ = x.powi(2).ln_1p(); - let _ = (x.powi(2) / 2.0).ln_1p(); + let _ = x.powi(3).ln_1p(); + let _ = (x.powi(3) / 2.0).ln_1p(); let _ = ((std::f32::consts::E - 1.0)).ln_1p(); let _ = x.ln_1p(); - let _ = x.powi(2).ln_1p(); + let _ = x.powi(3).ln_1p(); let _ = (x + 2.0).ln_1p(); let _ = (x / 2.0).ln_1p(); // Cases where the lint shouldn't be applied @@ -43,9 +43,9 @@ fn check_ln1p() { let _ = 2.0f64.ln_1p(); let _ = x.ln_1p(); let _ = (x / 2.0).ln_1p(); - let _ = x.powi(2).ln_1p(); + let _ = x.powi(3).ln_1p(); let _ = x.ln_1p(); - let _ = x.powi(2).ln_1p(); + let _ = x.powi(3).ln_1p(); let _ = (x + 2.0).ln_1p(); let _ = (x / 2.0).ln_1p(); // Cases where the lint shouldn't be applied diff --git a/src/tools/clippy/tests/ui/floating_point_log.rs b/src/tools/clippy/tests/ui/floating_point_log.rs index 8be0d9ad56f..01181484e7d 100644 --- a/src/tools/clippy/tests/ui/floating_point_log.rs +++ b/src/tools/clippy/tests/ui/floating_point_log.rs @@ -25,11 +25,11 @@ fn check_ln1p() { let _ = (1f32 + 2.0).ln(); let _ = (1.0 + x).ln(); let _ = (1.0 + x / 2.0).ln(); - let _ = (1.0 + x.powi(2)).ln(); - let _ = (1.0 + x.powi(2) / 2.0).ln(); + let _ = (1.0 + x.powi(3)).ln(); + let _ = (1.0 + x.powi(3) / 2.0).ln(); let _ = (1.0 + (std::f32::consts::E - 1.0)).ln(); let _ = (x + 1.0).ln(); - let _ = (x.powi(2) + 1.0).ln(); + let _ = (x.powi(3) + 1.0).ln(); let _ = (x + 2.0 + 1.0).ln(); let _ = (x / 2.0 + 1.0).ln(); // Cases where the lint shouldn't be applied @@ -43,9 +43,9 @@ fn check_ln1p() { let _ = (1f64 + 2.0).ln(); let _ = (1.0 + x).ln(); let _ = (1.0 + x / 2.0).ln(); - let _ = (1.0 + x.powi(2)).ln(); + let _ = (1.0 + x.powi(3)).ln(); let _ = (x + 1.0).ln(); - let _ = (x.powi(2) + 1.0).ln(); + let _ = (x.powi(3) + 1.0).ln(); let _ = (x + 2.0 + 1.0).ln(); let _ = (x / 2.0 + 1.0).ln(); // Cases where the lint shouldn't be applied diff --git a/src/tools/clippy/tests/ui/floating_point_log.stderr b/src/tools/clippy/tests/ui/floating_point_log.stderr index 943fbdb0b83..900dc2b7933 100644 --- a/src/tools/clippy/tests/ui/floating_point_log.stderr +++ b/src/tools/clippy/tests/ui/floating_point_log.stderr @@ -77,14 +77,14 @@ LL | let _ = (1.0 + x / 2.0).ln(); error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:28:13 | -LL | let _ = (1.0 + x.powi(2)).ln(); - | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(2).ln_1p()` +LL | let _ = (1.0 + x.powi(3)).ln(); + | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(3).ln_1p()` error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:29:13 | -LL | let _ = (1.0 + x.powi(2) / 2.0).ln(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(x.powi(2) / 2.0).ln_1p()` +LL | let _ = (1.0 + x.powi(3) / 2.0).ln(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(x.powi(3) / 2.0).ln_1p()` error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:30:13 @@ -101,8 +101,8 @@ LL | let _ = (x + 1.0).ln(); error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:32:13 | -LL | let _ = (x.powi(2) + 1.0).ln(); - | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(2).ln_1p()` +LL | let _ = (x.powi(3) + 1.0).ln(); + | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(3).ln_1p()` error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:33:13 @@ -143,8 +143,8 @@ LL | let _ = (1.0 + x / 2.0).ln(); error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:46:13 | -LL | let _ = (1.0 + x.powi(2)).ln(); - | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(2).ln_1p()` +LL | let _ = (1.0 + x.powi(3)).ln(); + | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(3).ln_1p()` error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:47:13 @@ -155,8 +155,8 @@ LL | let _ = (x + 1.0).ln(); error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:48:13 | -LL | let _ = (x.powi(2) + 1.0).ln(); - | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(2).ln_1p()` +LL | let _ = (x.powi(3) + 1.0).ln(); + | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(3).ln_1p()` error: ln(1 + x) can be computed more accurately --> $DIR/floating_point_log.rs:49:13 diff --git a/src/tools/clippy/tests/ui/floating_point_logbase.fixed b/src/tools/clippy/tests/ui/floating_point_logbase.fixed new file mode 100644 index 00000000000..13962a272d4 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_logbase.fixed @@ -0,0 +1,16 @@ +// run-rustfix +#![warn(clippy::suboptimal_flops)] + +fn main() { + let x = 3f32; + let y = 5f32; + let _ = x.log(y); + let _ = x.log(y); + let _ = x.log(y); + let _ = x.log(y); + // Cases where the lint shouldn't be applied + let _ = x.ln() / y.powf(3.2); + let _ = x.powf(3.2) / y.powf(3.2); + let _ = x.powf(3.2) / y.ln(); + let _ = x.log(5f32) / y.log(7f32); +} diff --git a/src/tools/clippy/tests/ui/floating_point_logbase.rs b/src/tools/clippy/tests/ui/floating_point_logbase.rs new file mode 100644 index 00000000000..26bc20d5370 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_logbase.rs @@ -0,0 +1,16 @@ +// run-rustfix +#![warn(clippy::suboptimal_flops)] + +fn main() { + let x = 3f32; + let y = 5f32; + let _ = x.ln() / y.ln(); + let _ = x.log2() / y.log2(); + let _ = x.log10() / y.log10(); + let _ = x.log(5f32) / y.log(5f32); + // Cases where the lint shouldn't be applied + let _ = x.ln() / y.powf(3.2); + let _ = x.powf(3.2) / y.powf(3.2); + let _ = x.powf(3.2) / y.ln(); + let _ = x.log(5f32) / y.log(7f32); +} diff --git a/src/tools/clippy/tests/ui/floating_point_logbase.stderr b/src/tools/clippy/tests/ui/floating_point_logbase.stderr new file mode 100644 index 00000000000..78354c2f62d --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_logbase.stderr @@ -0,0 +1,28 @@ +error: log base can be expressed more clearly + --> $DIR/floating_point_logbase.rs:7:13 + | +LL | let _ = x.ln() / y.ln(); + | ^^^^^^^^^^^^^^^ help: consider using: `x.log(y)` + | + = note: `-D clippy::suboptimal-flops` implied by `-D warnings` + +error: log base can be expressed more clearly + --> $DIR/floating_point_logbase.rs:8:13 + | +LL | let _ = x.log2() / y.log2(); + | ^^^^^^^^^^^^^^^^^^^ help: consider using: `x.log(y)` + +error: log base can be expressed more clearly + --> $DIR/floating_point_logbase.rs:9:13 + | +LL | let _ = x.log10() / y.log10(); + | ^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.log(y)` + +error: log base can be expressed more clearly + --> $DIR/floating_point_logbase.rs:10:13 + | +LL | let _ = x.log(5f32) / y.log(5f32); + | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.log(y)` + +error: aborting due to 4 previous errors + diff --git a/src/tools/clippy/tests/ui/floating_point_mul_add.fixed b/src/tools/clippy/tests/ui/floating_point_mul_add.fixed index e343c37740d..911700bab00 100644 --- a/src/tools/clippy/tests/ui/floating_point_mul_add.fixed +++ b/src/tools/clippy/tests/ui/floating_point_mul_add.fixed @@ -18,4 +18,9 @@ fn main() { let _ = a.mul_add(b, c).mul_add(a.mul_add(b, c), a.mul_add(b, c)) + c; let _ = 1234.567_f64.mul_add(45.67834_f64, 0.0004_f64); + + let _ = a.mul_add(a, b).sqrt(); + + // Cases where the lint shouldn't be applied + let _ = (a * a + b * b).sqrt(); } diff --git a/src/tools/clippy/tests/ui/floating_point_mul_add.rs b/src/tools/clippy/tests/ui/floating_point_mul_add.rs index 810f929c856..d202385fc8a 100644 --- a/src/tools/clippy/tests/ui/floating_point_mul_add.rs +++ b/src/tools/clippy/tests/ui/floating_point_mul_add.rs @@ -18,4 +18,9 @@ fn main() { let _ = a.mul_add(b, c) * a.mul_add(b, c) + a.mul_add(b, c) + c; let _ = 1234.567_f64 * 45.67834_f64 + 0.0004_f64; + + let _ = (a * a + b).sqrt(); + + // Cases where the lint shouldn't be applied + let _ = (a * a + b * b).sqrt(); } diff --git a/src/tools/clippy/tests/ui/floating_point_mul_add.stderr b/src/tools/clippy/tests/ui/floating_point_mul_add.stderr index 2dfbf562d15..ac8d0c0cae0 100644 --- a/src/tools/clippy/tests/ui/floating_point_mul_add.stderr +++ b/src/tools/clippy/tests/ui/floating_point_mul_add.stderr @@ -54,5 +54,11 @@ error: multiply and add expressions can be calculated more efficiently and accur LL | let _ = 1234.567_f64 * 45.67834_f64 + 0.0004_f64; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1234.567_f64.mul_add(45.67834_f64, 0.0004_f64)` -error: aborting due to 9 previous errors +error: multiply and add expressions can be calculated more efficiently and accurately + --> $DIR/floating_point_mul_add.rs:22:13 + | +LL | let _ = (a * a + b).sqrt(); + | ^^^^^^^^^^^ help: consider using: `a.mul_add(a, b)` + +error: aborting due to 10 previous errors diff --git a/src/tools/clippy/tests/ui/floating_point_powf.fixed b/src/tools/clippy/tests/ui/floating_point_powf.fixed index 78a9d44829b..b0641a100cd 100644 --- a/src/tools/clippy/tests/ui/floating_point_powf.fixed +++ b/src/tools/clippy/tests/ui/floating_point_powf.fixed @@ -11,7 +11,7 @@ fn main() { let _ = (-3.1f32).exp(); let _ = x.sqrt(); let _ = x.cbrt(); - let _ = x.powi(2); + let _ = x.powi(3); let _ = x.powi(-2); let _ = x.powi(16_777_215); let _ = x.powi(-16_777_215); @@ -30,7 +30,7 @@ fn main() { let _ = (-3.1f64).exp(); let _ = x.sqrt(); let _ = x.cbrt(); - let _ = x.powi(2); + let _ = x.powi(3); let _ = x.powi(-2); let _ = x.powi(-2_147_483_648); let _ = x.powi(2_147_483_647); diff --git a/src/tools/clippy/tests/ui/floating_point_powf.rs b/src/tools/clippy/tests/ui/floating_point_powf.rs index dbc1cac5cb4..a0a2c973900 100644 --- a/src/tools/clippy/tests/ui/floating_point_powf.rs +++ b/src/tools/clippy/tests/ui/floating_point_powf.rs @@ -11,7 +11,7 @@ fn main() { let _ = std::f32::consts::E.powf(-3.1); let _ = x.powf(1.0 / 2.0); let _ = x.powf(1.0 / 3.0); - let _ = x.powf(2.0); + let _ = x.powf(3.0); let _ = x.powf(-2.0); let _ = x.powf(16_777_215.0); let _ = x.powf(-16_777_215.0); @@ -30,7 +30,7 @@ fn main() { let _ = std::f64::consts::E.powf(-3.1); let _ = x.powf(1.0 / 2.0); let _ = x.powf(1.0 / 3.0); - let _ = x.powf(2.0); + let _ = x.powf(3.0); let _ = x.powf(-2.0); let _ = x.powf(-2_147_483_648.0); let _ = x.powf(2_147_483_647.0); diff --git a/src/tools/clippy/tests/ui/floating_point_powf.stderr b/src/tools/clippy/tests/ui/floating_point_powf.stderr index ad5163f0079..2422eb911e9 100644 --- a/src/tools/clippy/tests/ui/floating_point_powf.stderr +++ b/src/tools/clippy/tests/ui/floating_point_powf.stderr @@ -53,8 +53,8 @@ LL | let _ = x.powf(1.0 / 3.0); error: exponentiation with integer powers can be computed more efficiently --> $DIR/floating_point_powf.rs:14:13 | -LL | let _ = x.powf(2.0); - | ^^^^^^^^^^^ help: consider using: `x.powi(2)` +LL | let _ = x.powf(3.0); + | ^^^^^^^^^^^ help: consider using: `x.powi(3)` error: exponentiation with integer powers can be computed more efficiently --> $DIR/floating_point_powf.rs:15:13 @@ -125,8 +125,8 @@ LL | let _ = x.powf(1.0 / 3.0); error: exponentiation with integer powers can be computed more efficiently --> $DIR/floating_point_powf.rs:33:13 | -LL | let _ = x.powf(2.0); - | ^^^^^^^^^^^ help: consider using: `x.powi(2)` +LL | let _ = x.powf(3.0); + | ^^^^^^^^^^^ help: consider using: `x.powi(3)` error: exponentiation with integer powers can be computed more efficiently --> $DIR/floating_point_powf.rs:34:13 diff --git a/src/tools/clippy/tests/ui/floating_point_powi.fixed b/src/tools/clippy/tests/ui/floating_point_powi.fixed new file mode 100644 index 00000000000..56762400593 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_powi.fixed @@ -0,0 +1,19 @@ +// run-rustfix +#![warn(clippy::suboptimal_flops)] + +fn main() { + let one = 1; + let x = 3f32; + let _ = x * x; + let _ = x * x; + + let y = 4f32; + let _ = x.mul_add(x, y); + let _ = y.mul_add(y, x); + let _ = x.mul_add(x, y).sqrt(); + let _ = y.mul_add(y, x).sqrt(); + // Cases where the lint shouldn't be applied + let _ = x.powi(3); + let _ = x.powi(one + 1); + let _ = (x.powi(2) + y.powi(2)).sqrt(); +} diff --git a/src/tools/clippy/tests/ui/floating_point_powi.rs b/src/tools/clippy/tests/ui/floating_point_powi.rs new file mode 100644 index 00000000000..1f800e4628d --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_powi.rs @@ -0,0 +1,19 @@ +// run-rustfix +#![warn(clippy::suboptimal_flops)] + +fn main() { + let one = 1; + let x = 3f32; + let _ = x.powi(2); + let _ = x.powi(1 + 1); + + let y = 4f32; + let _ = x.powi(2) + y; + let _ = x + y.powi(2); + let _ = (x.powi(2) + y).sqrt(); + let _ = (x + y.powi(2)).sqrt(); + // Cases where the lint shouldn't be applied + let _ = x.powi(3); + let _ = x.powi(one + 1); + let _ = (x.powi(2) + y.powi(2)).sqrt(); +} diff --git a/src/tools/clippy/tests/ui/floating_point_powi.stderr b/src/tools/clippy/tests/ui/floating_point_powi.stderr new file mode 100644 index 00000000000..d5a5f1bcca1 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_powi.stderr @@ -0,0 +1,40 @@ +error: square can be computed more efficiently + --> $DIR/floating_point_powi.rs:7:13 + | +LL | let _ = x.powi(2); + | ^^^^^^^^^ help: consider using: `x * x` + | + = note: `-D clippy::suboptimal-flops` implied by `-D warnings` + +error: square can be computed more efficiently + --> $DIR/floating_point_powi.rs:8:13 + | +LL | let _ = x.powi(1 + 1); + | ^^^^^^^^^^^^^ help: consider using: `x * x` + +error: square can be computed more efficiently + --> $DIR/floating_point_powi.rs:11:13 + | +LL | let _ = x.powi(2) + y; + | ^^^^^^^^^^^^^ help: consider using: `x.mul_add(x, y)` + +error: square can be computed more efficiently + --> $DIR/floating_point_powi.rs:12:13 + | +LL | let _ = x + y.powi(2); + | ^^^^^^^^^^^^^ help: consider using: `y.mul_add(y, x)` + +error: square can be computed more efficiently + --> $DIR/floating_point_powi.rs:13:13 + | +LL | let _ = (x.powi(2) + y).sqrt(); + | ^^^^^^^^^^^^^^^ help: consider using: `x.mul_add(x, y)` + +error: square can be computed more efficiently + --> $DIR/floating_point_powi.rs:14:13 + | +LL | let _ = (x + y.powi(2)).sqrt(); + | ^^^^^^^^^^^^^^^ help: consider using: `y.mul_add(y, x)` + +error: aborting due to 6 previous errors + diff --git a/src/tools/clippy/tests/ui/floating_point_rad.fixed b/src/tools/clippy/tests/ui/floating_point_rad.fixed new file mode 100644 index 00000000000..92480c5db8b --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_rad.fixed @@ -0,0 +1,13 @@ +// run-rustfix +#![warn(clippy::suboptimal_flops)] + +fn main() { + let x = 3f32; + let _ = x.to_degrees(); + let _ = x.to_radians(); + // Cases where the lint shouldn't be applied + let _ = x * 90f32 / std::f32::consts::PI; + let _ = x * std::f32::consts::PI / 90f32; + let _ = x * 180f32 / std::f32::consts::E; + let _ = x * std::f32::consts::E / 180f32; +} diff --git a/src/tools/clippy/tests/ui/floating_point_rad.rs b/src/tools/clippy/tests/ui/floating_point_rad.rs new file mode 100644 index 00000000000..062e7c3fdc1 --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_rad.rs @@ -0,0 +1,13 @@ +// run-rustfix +#![warn(clippy::suboptimal_flops)] + +fn main() { + let x = 3f32; + let _ = x * 180f32 / std::f32::consts::PI; + let _ = x * std::f32::consts::PI / 180f32; + // Cases where the lint shouldn't be applied + let _ = x * 90f32 / std::f32::consts::PI; + let _ = x * std::f32::consts::PI / 90f32; + let _ = x * 180f32 / std::f32::consts::E; + let _ = x * std::f32::consts::E / 180f32; +} diff --git a/src/tools/clippy/tests/ui/floating_point_rad.stderr b/src/tools/clippy/tests/ui/floating_point_rad.stderr new file mode 100644 index 00000000000..a6ffdca64ee --- /dev/null +++ b/src/tools/clippy/tests/ui/floating_point_rad.stderr @@ -0,0 +1,16 @@ +error: conversion to degrees can be done more accurately + --> $DIR/floating_point_rad.rs:6:13 + | +LL | let _ = x * 180f32 / std::f32::consts::PI; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.to_degrees()` + | + = note: `-D clippy::suboptimal-flops` implied by `-D warnings` + +error: conversion to radians can be done more accurately + --> $DIR/floating_point_rad.rs:7:13 + | +LL | let _ = x * std::f32::consts::PI / 180f32; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.to_radians()` + +error: aborting due to 2 previous errors + diff --git a/src/tools/clippy/tests/ui/map_flatten.fixed b/src/tools/clippy/tests/ui/map_flatten.fixed index 7ac368878ab..4171d80f48a 100644 --- a/src/tools/clippy/tests/ui/map_flatten.fixed +++ b/src/tools/clippy/tests/ui/map_flatten.fixed @@ -2,6 +2,7 @@ #![warn(clippy::all, clippy::pedantic)] #![allow(clippy::missing_docs_in_private_items)] +#![allow(clippy::map_identity)] fn main() { let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect(); diff --git a/src/tools/clippy/tests/ui/map_flatten.rs b/src/tools/clippy/tests/ui/map_flatten.rs index a608601039c..16a0fd090ad 100644 --- a/src/tools/clippy/tests/ui/map_flatten.rs +++ b/src/tools/clippy/tests/ui/map_flatten.rs @@ -2,6 +2,7 @@ #![warn(clippy::all, clippy::pedantic)] #![allow(clippy::missing_docs_in_private_items)] +#![allow(clippy::map_identity)] fn main() { let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect(); diff --git a/src/tools/clippy/tests/ui/map_flatten.stderr b/src/tools/clippy/tests/ui/map_flatten.stderr index 3cf2abd5b6d..00bc41c15e9 100644 --- a/src/tools/clippy/tests/ui/map_flatten.stderr +++ b/src/tools/clippy/tests/ui/map_flatten.stderr @@ -1,5 +1,5 @@ error: called `map(..).flatten()` on an `Iterator`. This is more succinctly expressed by calling `.flat_map(..)` - --> $DIR/map_flatten.rs:7:21 + --> $DIR/map_flatten.rs:8:21 | LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `flat_map` instead: `vec![5_i8; 6].into_iter().flat_map(|x| 0..x)` @@ -7,7 +7,7 @@ LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().colle = note: `-D clippy::map-flatten` implied by `-D warnings` error: called `map(..).flatten()` on an `Option`. This is more succinctly expressed by calling `.and_then(..)` - --> $DIR/map_flatten.rs:8:24 + --> $DIR/map_flatten.rs:9:24 | LL | let _: Option<_> = (Some(Some(1))).map(|x| x).flatten(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `and_then` instead: `(Some(Some(1))).and_then(|x| x)` diff --git a/src/tools/clippy/tests/ui/map_identity.fixed b/src/tools/clippy/tests/ui/map_identity.fixed new file mode 100644 index 00000000000..4a1452b25f3 --- /dev/null +++ b/src/tools/clippy/tests/ui/map_identity.fixed @@ -0,0 +1,23 @@ +// run-rustfix +#![warn(clippy::map_identity)] +#![allow(clippy::needless_return)] + +fn main() { + let x: [u16; 3] = [1, 2, 3]; + // should lint + let _: Vec<_> = x.iter().map(not_identity).collect(); + let _: Vec<_> = x.iter().collect(); + let _: Option<u8> = Some(3); + let _: Result<i8, f32> = Ok(-3); + // should not lint + let _: Vec<_> = x.iter().map(|x| 2 * x).collect(); + let _: Vec<_> = x.iter().map(not_identity).map(|x| return x - 4).collect(); + let _: Option<u8> = None.map(|x: u8| x - 1); + let _: Result<i8, f32> = Err(2.3).map(|x: i8| { + return x + 3; + }); +} + +fn not_identity(x: &u16) -> u16 { + *x +} diff --git a/src/tools/clippy/tests/ui/map_identity.rs b/src/tools/clippy/tests/ui/map_identity.rs new file mode 100644 index 00000000000..65c7e6e1ea5 --- /dev/null +++ b/src/tools/clippy/tests/ui/map_identity.rs @@ -0,0 +1,25 @@ +// run-rustfix +#![warn(clippy::map_identity)] +#![allow(clippy::needless_return)] + +fn main() { + let x: [u16; 3] = [1, 2, 3]; + // should lint + let _: Vec<_> = x.iter().map(not_identity).map(|x| return x).collect(); + let _: Vec<_> = x.iter().map(std::convert::identity).map(|y| y).collect(); + let _: Option<u8> = Some(3).map(|x| x); + let _: Result<i8, f32> = Ok(-3).map(|x| { + return x; + }); + // should not lint + let _: Vec<_> = x.iter().map(|x| 2 * x).collect(); + let _: Vec<_> = x.iter().map(not_identity).map(|x| return x - 4).collect(); + let _: Option<u8> = None.map(|x: u8| x - 1); + let _: Result<i8, f32> = Err(2.3).map(|x: i8| { + return x + 3; + }); +} + +fn not_identity(x: &u16) -> u16 { + *x +} diff --git a/src/tools/clippy/tests/ui/map_identity.stderr b/src/tools/clippy/tests/ui/map_identity.stderr new file mode 100644 index 00000000000..e4a0320cbda --- /dev/null +++ b/src/tools/clippy/tests/ui/map_identity.stderr @@ -0,0 +1,37 @@ +error: unnecessary map of the identity function + --> $DIR/map_identity.rs:8:47 + | +LL | let _: Vec<_> = x.iter().map(not_identity).map(|x| return x).collect(); + | ^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + | + = note: `-D clippy::map-identity` implied by `-D warnings` + +error: unnecessary map of the identity function + --> $DIR/map_identity.rs:9:57 + | +LL | let _: Vec<_> = x.iter().map(std::convert::identity).map(|y| y).collect(); + | ^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> $DIR/map_identity.rs:9:29 + | +LL | let _: Vec<_> = x.iter().map(std::convert::identity).map(|y| y).collect(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> $DIR/map_identity.rs:10:32 + | +LL | let _: Option<u8> = Some(3).map(|x| x); + | ^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> $DIR/map_identity.rs:11:36 + | +LL | let _: Result<i8, f32> = Ok(-3).map(|x| { + | ____________________________________^ +LL | | return x; +LL | | }); + | |______^ help: remove the call to `map` + +error: aborting due to 5 previous errors + diff --git a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed new file mode 100644 index 00000000000..f3e19092480 --- /dev/null +++ b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.fixed @@ -0,0 +1,36 @@ +// run-rustfix + +#![warn(clippy::match_like_matches_macro)] +#![allow(unreachable_patterns)] + +fn main() { + let x = Some(5); + + // Lint + let _y = matches!(x, Some(0)); + + // Lint + let _w = matches!(x, Some(_)); + + // Turn into is_none + let _z = x.is_none(); + + // Lint + let _zz = !matches!(x, Some(r) if r == 0); + + // Lint + let _zzz = matches!(x, Some(5)); + + // No lint + let _a = match x { + Some(_) => false, + _ => false, + }; + + // No lint + let _ab = match x { + Some(0) => false, + _ => true, + None => false, + }; +} diff --git a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs new file mode 100644 index 00000000000..fbae7c18b92 --- /dev/null +++ b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.rs @@ -0,0 +1,48 @@ +// run-rustfix + +#![warn(clippy::match_like_matches_macro)] +#![allow(unreachable_patterns)] + +fn main() { + let x = Some(5); + + // Lint + let _y = match x { + Some(0) => true, + _ => false, + }; + + // Lint + let _w = match x { + Some(_) => true, + _ => false, + }; + + // Turn into is_none + let _z = match x { + Some(_) => false, + None => true, + }; + + // Lint + let _zz = match x { + Some(r) if r == 0 => false, + _ => true, + }; + + // Lint + let _zzz = if let Some(5) = x { true } else { false }; + + // No lint + let _a = match x { + Some(_) => false, + _ => false, + }; + + // No lint + let _ab = match x { + Some(0) => false, + _ => true, + None => false, + }; +} diff --git a/src/tools/clippy/tests/ui/match_expr_like_matches_macro.stderr b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.stderr new file mode 100644 index 00000000000..4668f8565a6 --- /dev/null +++ b/src/tools/clippy/tests/ui/match_expr_like_matches_macro.stderr @@ -0,0 +1,52 @@ +error: match expression looks like `matches!` macro + --> $DIR/match_expr_like_matches_macro.rs:10:14 + | +LL | let _y = match x { + | ______________^ +LL | | Some(0) => true, +LL | | _ => false, +LL | | }; + | |_____^ help: try this: `matches!(x, Some(0))` + | + = note: `-D clippy::match-like-matches-macro` implied by `-D warnings` + +error: match expression looks like `matches!` macro + --> $DIR/match_expr_like_matches_macro.rs:16:14 + | +LL | let _w = match x { + | ______________^ +LL | | Some(_) => true, +LL | | _ => false, +LL | | }; + | |_____^ help: try this: `matches!(x, Some(_))` + +error: redundant pattern matching, consider using `is_none()` + --> $DIR/match_expr_like_matches_macro.rs:22:14 + | +LL | let _z = match x { + | ______________^ +LL | | Some(_) => false, +LL | | None => true, +LL | | }; + | |_____^ help: try this: `x.is_none()` + | + = note: `-D clippy::redundant-pattern-matching` implied by `-D warnings` + +error: match expression looks like `matches!` macro + --> $DIR/match_expr_like_matches_macro.rs:28:15 + | +LL | let _zz = match x { + | _______________^ +LL | | Some(r) if r == 0 => false, +LL | | _ => true, +LL | | }; + | |_____^ help: try this: `!matches!(x, Some(r) if r == 0)` + +error: if let .. else expression looks like `matches!` macro + --> $DIR/match_expr_like_matches_macro.rs:34:16 + | +LL | let _zzz = if let Some(5) = x { true } else { false }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `matches!(x, Some(5))` + +error: aborting due to 5 previous errors + diff --git a/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.rs b/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.rs index 0b471195272..2d392c593b3 100644 --- a/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.rs +++ b/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.rs @@ -4,7 +4,7 @@ use std::cmp::Ordering; -#[allow(clippy::unnested_or_patterns)] +#[allow(clippy::unnested_or_patterns, clippy::match_like_matches_macro)] #[warn(clippy::neg_cmp_op_on_partial_ord)] fn main() { let a_value = 1.0; diff --git a/src/tools/clippy/tests/ui/option_if_let_else.fixed b/src/tools/clippy/tests/ui/option_if_let_else.fixed new file mode 100644 index 00000000000..695a460cc4e --- /dev/null +++ b/src/tools/clippy/tests/ui/option_if_let_else.fixed @@ -0,0 +1,74 @@ +// run-rustfix +#![warn(clippy::option_if_let_else)] + +fn bad1(string: Option<&str>) -> (bool, &str) { + string.map_or((false, "hello"), |x| (true, x)) +} + +fn else_if_option(string: Option<&str>) -> Option<(bool, &str)> { + if string.is_none() { + None + } else { string.map_or(Some((false, "")), |x| Some((true, x))) } +} + +fn unop_bad(string: &Option<&str>, mut num: Option<i32>) { + let _ = string.map_or(0, |s| s.len()); + let _ = num.as_ref().map_or(&0, |s| s); + let _ = num.as_mut().map_or(&mut 0, |s| { + *s += 1; + s + }); + let _ = num.as_ref().map_or(&0, |s| s); + let _ = num.map_or(0, |mut s| { + s += 1; + s + }); + let _ = num.as_mut().map_or(&mut 0, |s| { + *s += 1; + s + }); +} + +fn longer_body(arg: Option<u32>) -> u32 { + arg.map_or(13, |x| { + let y = x * x; + y * y + }) +} + +fn test_map_or_else(arg: Option<u32>) { + let _ = arg.map_or_else(|| { + let mut y = 1; + y = (y + 2 / y) / 2; + y = (y + 2 / y) / 2; + y + }, |x| x * x * x * x); +} + +fn negative_tests(arg: Option<u32>) -> u32 { + let _ = if let Some(13) = arg { "unlucky" } else { "lucky" }; + for _ in 0..10 { + let _ = if let Some(x) = arg { + x + } else { + continue; + }; + } + let _ = if let Some(x) = arg { + return x; + } else { + 5 + }; + 7 +} + +fn main() { + let optional = Some(5); + let _ = optional.map_or(5, |x| x + 2); + let _ = bad1(None); + let _ = else_if_option(None); + unop_bad(&None, None); + let _ = longer_body(None); + test_map_or_else(None); + let _ = negative_tests(None); +} diff --git a/src/tools/clippy/tests/ui/option_if_let_else.rs b/src/tools/clippy/tests/ui/option_if_let_else.rs new file mode 100644 index 00000000000..dee80d26bd9 --- /dev/null +++ b/src/tools/clippy/tests/ui/option_if_let_else.rs @@ -0,0 +1,92 @@ +// run-rustfix +#![warn(clippy::option_if_let_else)] + +fn bad1(string: Option<&str>) -> (bool, &str) { + if let Some(x) = string { + (true, x) + } else { + (false, "hello") + } +} + +fn else_if_option(string: Option<&str>) -> Option<(bool, &str)> { + if string.is_none() { + None + } else if let Some(x) = string { + Some((true, x)) + } else { + Some((false, "")) + } +} + +fn unop_bad(string: &Option<&str>, mut num: Option<i32>) { + let _ = if let Some(s) = *string { s.len() } else { 0 }; + let _ = if let Some(s) = &num { s } else { &0 }; + let _ = if let Some(s) = &mut num { + *s += 1; + s + } else { + &mut 0 + }; + let _ = if let Some(ref s) = num { s } else { &0 }; + let _ = if let Some(mut s) = num { + s += 1; + s + } else { + 0 + }; + let _ = if let Some(ref mut s) = num { + *s += 1; + s + } else { + &mut 0 + }; +} + +fn longer_body(arg: Option<u32>) -> u32 { + if let Some(x) = arg { + let y = x * x; + y * y + } else { + 13 + } +} + +fn test_map_or_else(arg: Option<u32>) { + let _ = if let Some(x) = arg { + x * x * x * x + } else { + let mut y = 1; + y = (y + 2 / y) / 2; + y = (y + 2 / y) / 2; + y + }; +} + +fn negative_tests(arg: Option<u32>) -> u32 { + let _ = if let Some(13) = arg { "unlucky" } else { "lucky" }; + for _ in 0..10 { + let _ = if let Some(x) = arg { + x + } else { + continue; + }; + } + let _ = if let Some(x) = arg { + return x; + } else { + 5 + }; + 7 +} + +fn main() { + let optional = Some(5); + let _ = if let Some(x) = optional { x + 2 } else { 5 }; + let _ = bad1(None); + let _ = else_if_option(None); + unop_bad(&None, None); + let _ = longer_body(None); + test_map_or_else(None); + let _ = negative_tests(None); +} diff --git a/src/tools/clippy/tests/ui/option_if_let_else.stderr b/src/tools/clippy/tests/ui/option_if_let_else.stderr new file mode 100644 index 00000000000..7005850efaf --- /dev/null +++ b/src/tools/clippy/tests/ui/option_if_let_else.stderr @@ -0,0 +1,151 @@ +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:5:5 + | +LL | / if let Some(x) = string { +LL | | (true, x) +LL | | } else { +LL | | (false, "hello") +LL | | } + | |_____^ help: try: `string.map_or((false, "hello"), |x| (true, x))` + | + = note: `-D clippy::option-if-let-else` implied by `-D warnings` + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:15:12 + | +LL | } else if let Some(x) = string { + | ____________^ +LL | | Some((true, x)) +LL | | } else { +LL | | Some((false, "")) +LL | | } + | |_____^ help: try: `{ string.map_or(Some((false, "")), |x| Some((true, x))) }` + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:23:13 + | +LL | let _ = if let Some(s) = *string { s.len() } else { 0 }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `string.map_or(0, |s| s.len())` + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:24:13 + | +LL | let _ = if let Some(s) = &num { s } else { &0 }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `num.as_ref().map_or(&0, |s| s)` + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:25:13 + | +LL | let _ = if let Some(s) = &mut num { + | _____________^ +LL | | *s += 1; +LL | | s +LL | | } else { +LL | | &mut 0 +LL | | }; + | |_____^ + | +help: try + | +LL | let _ = num.as_mut().map_or(&mut 0, |s| { +LL | *s += 1; +LL | s +LL | }); + | + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:31:13 + | +LL | let _ = if let Some(ref s) = num { s } else { &0 }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `num.as_ref().map_or(&0, |s| s)` + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:32:13 + | +LL | let _ = if let Some(mut s) = num { + | _____________^ +LL | | s += 1; +LL | | s +LL | | } else { +LL | | 0 +LL | | }; + | |_____^ + | +help: try + | +LL | let _ = num.map_or(0, |mut s| { +LL | s += 1; +LL | s +LL | }); + | + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:38:13 + | +LL | let _ = if let Some(ref mut s) = num { + | _____________^ +LL | | *s += 1; +LL | | s +LL | | } else { +LL | | &mut 0 +LL | | }; + | |_____^ + | +help: try + | +LL | let _ = num.as_mut().map_or(&mut 0, |s| { +LL | *s += 1; +LL | s +LL | }); + | + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:47:5 + | +LL | / if let Some(x) = arg { +LL | | let y = x * x; +LL | | y * y +LL | | } else { +LL | | 13 +LL | | } + | |_____^ + | +help: try + | +LL | arg.map_or(13, |x| { +LL | let y = x * x; +LL | y * y +LL | }) + | + +error: use Option::map_or_else instead of an if let/else + --> $DIR/option_if_let_else.rs:56:13 + | +LL | let _ = if let Some(x) = arg { + | _____________^ +LL | | x * x * x * x +LL | | } else { +LL | | let mut y = 1; +... | +LL | | y +LL | | }; + | |_____^ + | +help: try + | +LL | let _ = arg.map_or_else(|| { +LL | let mut y = 1; +LL | y = (y + 2 / y) / 2; +LL | y = (y + 2 / y) / 2; +LL | y +LL | }, |x| x * x * x * x); + | + +error: use Option::map_or instead of an if let/else + --> $DIR/option_if_let_else.rs:85:13 + | +LL | let _ = if let Some(x) = optional { x + 2 } else { 5 }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `optional.map_or(5, |x| x + 2)` + +error: aborting due to 11 previous errors + diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/mutability.rs b/src/tools/clippy/tests/ui/pattern_type_mismatch/mutability.rs new file mode 100644 index 00000000000..9b4f2f1f579 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/mutability.rs @@ -0,0 +1,40 @@ +#![allow(clippy::all)] +#![warn(clippy::pattern_type_mismatch)] + +fn main() {} + +fn should_lint() { + let value = &Some(23); + match value { + Some(_) => (), + _ => (), + } + + let value = &mut Some(23); + match value { + Some(_) => (), + _ => (), + } +} + +fn should_not_lint() { + let value = &Some(23); + match value { + &Some(_) => (), + _ => (), + } + match *value { + Some(_) => (), + _ => (), + } + + let value = &mut Some(23); + match value { + &mut Some(_) => (), + _ => (), + } + match *value { + Some(_) => (), + _ => (), + } +} diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/mutability.stderr b/src/tools/clippy/tests/ui/pattern_type_mismatch/mutability.stderr new file mode 100644 index 00000000000..3421d568365 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/mutability.stderr @@ -0,0 +1,19 @@ +error: type of pattern does not match the expression type + --> $DIR/mutability.rs:9:9 + | +LL | Some(_) => (), + | ^^^^^^^ + | + = note: `-D clippy::pattern-type-mismatch` implied by `-D warnings` + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/mutability.rs:15:9 + | +LL | Some(_) => (), + | ^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&mut _` pattern and adjust the enclosed variable bindings + +error: aborting due to 2 previous errors + diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_alternatives.rs b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_alternatives.rs new file mode 100644 index 00000000000..065ea9fb9b5 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_alternatives.rs @@ -0,0 +1,24 @@ +#![allow(clippy::all)] +#![warn(clippy::pattern_type_mismatch)] + +fn main() {} + +fn alternatives() { + enum Value<'a> { + Unused, + A(&'a Option<i32>), + B, + } + let ref_value = &Value::A(&Some(23)); + + // not ok + if let Value::B | Value::A(_) = ref_value {} + if let &Value::B | &Value::A(Some(_)) = ref_value {} + if let Value::B | Value::A(Some(_)) = *ref_value {} + + // ok + if let &Value::B | &Value::A(_) = ref_value {} + if let Value::B | Value::A(_) = *ref_value {} + if let &Value::B | &Value::A(&Some(_)) = ref_value {} + if let Value::B | Value::A(&Some(_)) = *ref_value {} +} diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_alternatives.stderr b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_alternatives.stderr new file mode 100644 index 00000000000..d285c93782c --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_alternatives.stderr @@ -0,0 +1,27 @@ +error: type of pattern does not match the expression type + --> $DIR/pattern_alternatives.rs:15:12 + | +LL | if let Value::B | Value::A(_) = ref_value {} + | ^^^^^^^^^^^^^^^^^^^^^^ + | + = note: `-D clippy::pattern-type-mismatch` implied by `-D warnings` + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_alternatives.rs:16:34 + | +LL | if let &Value::B | &Value::A(Some(_)) = ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_alternatives.rs:17:32 + | +LL | if let Value::B | Value::A(Some(_)) = *ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: aborting due to 3 previous errors + diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_structs.rs b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_structs.rs new file mode 100644 index 00000000000..417b1c107c5 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_structs.rs @@ -0,0 +1,45 @@ +#![allow(clippy::all)] +#![warn(clippy::pattern_type_mismatch)] + +fn main() {} + +fn struct_types() { + struct Struct<'a> { + ref_inner: &'a Option<i32>, + } + let ref_value = &Struct { ref_inner: &Some(42) }; + + // not ok + let Struct { .. } = ref_value; + if let &Struct { ref_inner: Some(_) } = ref_value {} + if let Struct { ref_inner: Some(_) } = *ref_value {} + + // ok + let &Struct { .. } = ref_value; + let Struct { .. } = *ref_value; + if let &Struct { ref_inner: &Some(_) } = ref_value {} + if let Struct { ref_inner: &Some(_) } = *ref_value {} +} + +fn struct_enum_variants() { + enum StructEnum<'a> { + Empty, + Var { inner_ref: &'a Option<i32> }, + } + let ref_value = &StructEnum::Var { inner_ref: &Some(42) }; + + // not ok + if let StructEnum::Var { .. } = ref_value {} + if let StructEnum::Var { inner_ref: Some(_) } = ref_value {} + if let &StructEnum::Var { inner_ref: Some(_) } = ref_value {} + if let StructEnum::Var { inner_ref: Some(_) } = *ref_value {} + if let StructEnum::Empty = ref_value {} + + // ok + if let &StructEnum::Var { .. } = ref_value {} + if let StructEnum::Var { .. } = *ref_value {} + if let &StructEnum::Var { inner_ref: &Some(_) } = ref_value {} + if let StructEnum::Var { inner_ref: &Some(_) } = *ref_value {} + if let &StructEnum::Empty = ref_value {} + if let StructEnum::Empty = *ref_value {} +} diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_structs.stderr b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_structs.stderr new file mode 100644 index 00000000000..d428e85b0c9 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_structs.stderr @@ -0,0 +1,67 @@ +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:13:9 + | +LL | let Struct { .. } = ref_value; + | ^^^^^^^^^^^^^ + | + = note: `-D clippy::pattern-type-mismatch` implied by `-D warnings` + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:14:33 + | +LL | if let &Struct { ref_inner: Some(_) } = ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:15:32 + | +LL | if let Struct { ref_inner: Some(_) } = *ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:32:12 + | +LL | if let StructEnum::Var { .. } = ref_value {} + | ^^^^^^^^^^^^^^^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:33:12 + | +LL | if let StructEnum::Var { inner_ref: Some(_) } = ref_value {} + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:34:42 + | +LL | if let &StructEnum::Var { inner_ref: Some(_) } = ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:35:41 + | +LL | if let StructEnum::Var { inner_ref: Some(_) } = *ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_structs.rs:36:12 + | +LL | if let StructEnum::Empty = ref_value {} + | ^^^^^^^^^^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: aborting due to 8 previous errors + diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_tuples.rs b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_tuples.rs new file mode 100644 index 00000000000..19504a051d8 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_tuples.rs @@ -0,0 +1,57 @@ +#![allow(clippy::all)] +#![warn(clippy::pattern_type_mismatch)] + +fn main() {} + +fn tuple_types() { + struct TupleStruct<'a>(&'a Option<i32>); + let ref_value = &TupleStruct(&Some(42)); + + // not ok + let TupleStruct(_) = ref_value; + if let &TupleStruct(Some(_)) = ref_value {} + if let TupleStruct(Some(_)) = *ref_value {} + + // ok + let &TupleStruct(_) = ref_value; + let TupleStruct(_) = *ref_value; + if let &TupleStruct(&Some(_)) = ref_value {} + if let TupleStruct(&Some(_)) = *ref_value {} +} + +fn tuple_enum_variants() { + enum TupleEnum<'a> { + Empty, + Var(&'a Option<i32>), + } + let ref_value = &TupleEnum::Var(&Some(42)); + + // not ok + if let TupleEnum::Var(_) = ref_value {} + if let &TupleEnum::Var(Some(_)) = ref_value {} + if let TupleEnum::Var(Some(_)) = *ref_value {} + if let TupleEnum::Empty = ref_value {} + + // ok + if let &TupleEnum::Var(_) = ref_value {} + if let TupleEnum::Var(_) = *ref_value {} + if let &TupleEnum::Var(&Some(_)) = ref_value {} + if let TupleEnum::Var(&Some(_)) = *ref_value {} + if let &TupleEnum::Empty = ref_value {} + if let TupleEnum::Empty = *ref_value {} +} + +fn plain_tuples() { + let ref_value = &(&Some(23), &Some(42)); + + // not ok + let (_a, _b) = ref_value; + if let &(_a, Some(_)) = ref_value {} + if let (_a, Some(_)) = *ref_value {} + + // ok + let &(_a, _b) = ref_value; + let (_a, _b) = *ref_value; + if let &(_a, &Some(_)) = ref_value {} + if let (_a, &Some(_)) = *ref_value {} +} diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_tuples.stderr b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_tuples.stderr new file mode 100644 index 00000000000..edd0074d00d --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/pattern_tuples.stderr @@ -0,0 +1,83 @@ +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:11:9 + | +LL | let TupleStruct(_) = ref_value; + | ^^^^^^^^^^^^^^ + | + = note: `-D clippy::pattern-type-mismatch` implied by `-D warnings` + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:12:25 + | +LL | if let &TupleStruct(Some(_)) = ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:13:24 + | +LL | if let TupleStruct(Some(_)) = *ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:30:12 + | +LL | if let TupleEnum::Var(_) = ref_value {} + | ^^^^^^^^^^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:31:28 + | +LL | if let &TupleEnum::Var(Some(_)) = ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:32:27 + | +LL | if let TupleEnum::Var(Some(_)) = *ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:33:12 + | +LL | if let TupleEnum::Empty = ref_value {} + | ^^^^^^^^^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:48:9 + | +LL | let (_a, _b) = ref_value; + | ^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:49:18 + | +LL | if let &(_a, Some(_)) = ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/pattern_tuples.rs:50:17 + | +LL | if let (_a, Some(_)) = *ref_value {} + | ^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: aborting due to 10 previous errors + diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/syntax.rs b/src/tools/clippy/tests/ui/pattern_type_mismatch/syntax.rs new file mode 100644 index 00000000000..e89917c41e8 --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/syntax.rs @@ -0,0 +1,146 @@ +#![allow(clippy::all)] +#![warn(clippy::pattern_type_mismatch)] + +fn main() {} + +fn syntax_match() { + let ref_value = &Some(&Some(42)); + + // not ok + match ref_value { + Some(_) => (), + None => (), + } + + // ok + match ref_value { + &Some(_) => (), + &None => (), + } + match *ref_value { + Some(_) => (), + None => (), + } +} + +fn syntax_if_let() { + let ref_value = &Some(42); + + // not ok + if let Some(_) = ref_value {} + + // ok + if let &Some(_) = ref_value {} + if let Some(_) = *ref_value {} +} + +fn syntax_while_let() { + let ref_value = &Some(42); + + // not ok + while let Some(_) = ref_value { + break; + } + + // ok + while let &Some(_) = ref_value { + break; + } + while let Some(_) = *ref_value { + break; + } +} + +fn syntax_for() { + let ref_value = &Some(23); + let slice = &[(2, 3), (4, 2)]; + + // not ok + for (_a, _b) in slice.iter() {} + + // ok + for &(_a, _b) in slice.iter() {} +} + +fn syntax_let() { + let ref_value = &(2, 3); + + // not ok + let (_n, _m) = ref_value; + + // ok + let &(_n, _m) = ref_value; + let (_n, _m) = *ref_value; +} + +fn syntax_fn() { + // not ok + fn foo((_a, _b): &(i32, i32)) {} + + // ok + fn foo_ok_1(&(_a, _b): &(i32, i32)) {} +} + +fn syntax_closure() { + fn foo<F>(f: F) + where + F: FnOnce(&(i32, i32)), + { + } + + // not ok + foo(|(_a, _b)| ()); + + // ok + foo(|&(_a, _b)| ()); +} + +fn macro_with_expression() { + macro_rules! matching_macro { + ($e:expr) => { + $e + }; + } + let value = &Some(23); + + // not ok + matching_macro!(match value { + Some(_) => (), + _ => (), + }); + + // ok + matching_macro!(match value { + &Some(_) => (), + _ => (), + }); + matching_macro!(match *value { + Some(_) => (), + _ => (), + }); +} + +fn macro_expansion() { + macro_rules! matching_macro { + ($e:expr) => { + // not ok + match $e { + Some(_) => (), + _ => (), + } + + // ok + match $e { + &Some(_) => (), + _ => (), + } + match *$e { + Some(_) => (), + _ => (), + } + }; + } + + let value = &Some(23); + matching_macro!(value); +} diff --git a/src/tools/clippy/tests/ui/pattern_type_mismatch/syntax.stderr b/src/tools/clippy/tests/ui/pattern_type_mismatch/syntax.stderr new file mode 100644 index 00000000000..5a5186bd4fc --- /dev/null +++ b/src/tools/clippy/tests/ui/pattern_type_mismatch/syntax.stderr @@ -0,0 +1,79 @@ +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:11:9 + | +LL | Some(_) => (), + | ^^^^^^^ + | + = note: `-D clippy::pattern-type-mismatch` implied by `-D warnings` + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:30:12 + | +LL | if let Some(_) = ref_value {} + | ^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:41:15 + | +LL | while let Some(_) = ref_value { + | ^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:59:9 + | +LL | for (_a, _b) in slice.iter() {} + | ^^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:69:9 + | +LL | let (_n, _m) = ref_value; + | ^^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:78:12 + | +LL | fn foo((_a, _b): &(i32, i32)) {} + | ^^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:92:10 + | +LL | foo(|(_a, _b)| ()); + | ^^^^^^^^ + | + = help: explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:108:9 + | +LL | Some(_) => (), + | ^^^^^^^ + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + +error: type of pattern does not match the expression type + --> $DIR/syntax.rs:128:17 + | +LL | Some(_) => (), + | ^^^^^^^ +... +LL | matching_macro!(value); + | ----------------------- in this macro invocation + | + = help: use `*` to dereference the match expression or explicitly match against a `&_` pattern and adjust the enclosed variable bindings + = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) + +error: aborting due to 9 previous errors + diff --git a/src/tools/clippy/tests/ui/range_plus_minus_one.fixed b/src/tools/clippy/tests/ui/range_plus_minus_one.fixed index 6b402114099..19b253b0fe2 100644 --- a/src/tools/clippy/tests/ui/range_plus_minus_one.fixed +++ b/src/tools/clippy/tests/ui/range_plus_minus_one.fixed @@ -7,6 +7,7 @@ fn f() -> usize { } #[warn(clippy::range_plus_one)] +#[warn(clippy::range_minus_one)] fn main() { for _ in 0..2 {} for _ in 0..=2 {} diff --git a/src/tools/clippy/tests/ui/range_plus_minus_one.rs b/src/tools/clippy/tests/ui/range_plus_minus_one.rs index 3cfed4125b3..7d034117547 100644 --- a/src/tools/clippy/tests/ui/range_plus_minus_one.rs +++ b/src/tools/clippy/tests/ui/range_plus_minus_one.rs @@ -7,6 +7,7 @@ fn f() -> usize { } #[warn(clippy::range_plus_one)] +#[warn(clippy::range_minus_one)] fn main() { for _ in 0..2 {} for _ in 0..=2 {} diff --git a/src/tools/clippy/tests/ui/range_plus_minus_one.stderr b/src/tools/clippy/tests/ui/range_plus_minus_one.stderr index f72943a04f2..fb4f1658597 100644 --- a/src/tools/clippy/tests/ui/range_plus_minus_one.stderr +++ b/src/tools/clippy/tests/ui/range_plus_minus_one.stderr @@ -1,5 +1,5 @@ error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:14:14 + --> $DIR/range_plus_minus_one.rs:15:14 | LL | for _ in 0..3 + 1 {} | ^^^^^^^^ help: use: `0..=3` @@ -7,25 +7,25 @@ LL | for _ in 0..3 + 1 {} = note: `-D clippy::range-plus-one` implied by `-D warnings` error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:17:14 + --> $DIR/range_plus_minus_one.rs:18:14 | LL | for _ in 0..1 + 5 {} | ^^^^^^^^ help: use: `0..=5` error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:20:14 + --> $DIR/range_plus_minus_one.rs:21:14 | LL | for _ in 1..1 + 1 {} | ^^^^^^^^ help: use: `1..=1` error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:26:14 + --> $DIR/range_plus_minus_one.rs:27:14 | LL | for _ in 0..(1 + f()) {} | ^^^^^^^^^^^^ help: use: `0..=f()` error: an exclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:30:13 + --> $DIR/range_plus_minus_one.rs:31:13 | LL | let _ = ..=11 - 1; | ^^^^^^^^^ help: use: `..11` @@ -33,25 +33,25 @@ LL | let _ = ..=11 - 1; = note: `-D clippy::range-minus-one` implied by `-D warnings` error: an exclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:31:13 + --> $DIR/range_plus_minus_one.rs:32:13 | LL | let _ = ..=(11 - 1); | ^^^^^^^^^^^ help: use: `..11` error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:32:13 + --> $DIR/range_plus_minus_one.rs:33:13 | LL | let _ = (1..11 + 1); | ^^^^^^^^^^^ help: use: `(1..=11)` error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:33:13 + --> $DIR/range_plus_minus_one.rs:34:13 | LL | let _ = (f() + 1)..(f() + 1); | ^^^^^^^^^^^^^^^^^^^^ help: use: `((f() + 1)..=f())` error: an inclusive range would be more readable - --> $DIR/range_plus_minus_one.rs:37:14 + --> $DIR/range_plus_minus_one.rs:38:14 | LL | for _ in 1..ONE + ONE {} | ^^^^^^^^^^^^ help: use: `1..=ONE` diff --git a/src/tools/clippy/tests/ui/redundant_pattern_matching.fixed b/src/tools/clippy/tests/ui/redundant_pattern_matching.fixed index 8b4e2d21331..ce8582d2b22 100644 --- a/src/tools/clippy/tests/ui/redundant_pattern_matching.fixed +++ b/src/tools/clippy/tests/ui/redundant_pattern_matching.fixed @@ -2,7 +2,13 @@ #![warn(clippy::all)] #![warn(clippy::redundant_pattern_matching)] -#![allow(clippy::unit_arg, unused_must_use, clippy::needless_bool, deprecated)] +#![allow( + clippy::unit_arg, + unused_must_use, + clippy::needless_bool, + clippy::match_like_matches_macro, + deprecated +)] fn main() { if Ok::<i32, i32>(42).is_ok() {} diff --git a/src/tools/clippy/tests/ui/redundant_pattern_matching.rs b/src/tools/clippy/tests/ui/redundant_pattern_matching.rs index b0904e41b6f..a3a9aa40e3b 100644 --- a/src/tools/clippy/tests/ui/redundant_pattern_matching.rs +++ b/src/tools/clippy/tests/ui/redundant_pattern_matching.rs @@ -2,7 +2,13 @@ #![warn(clippy::all)] #![warn(clippy::redundant_pattern_matching)] -#![allow(clippy::unit_arg, unused_must_use, clippy::needless_bool, deprecated)] +#![allow( + clippy::unit_arg, + unused_must_use, + clippy::needless_bool, + clippy::match_like_matches_macro, + deprecated +)] fn main() { if let Ok(_) = Ok::<i32, i32>(42) {} diff --git a/src/tools/clippy/tests/ui/redundant_pattern_matching.stderr b/src/tools/clippy/tests/ui/redundant_pattern_matching.stderr index 51a6f4350d3..25d1476062e 100644 --- a/src/tools/clippy/tests/ui/redundant_pattern_matching.stderr +++ b/src/tools/clippy/tests/ui/redundant_pattern_matching.stderr @@ -1,5 +1,5 @@ error: redundant pattern matching, consider using `is_ok()` - --> $DIR/redundant_pattern_matching.rs:8:12 + --> $DIR/redundant_pattern_matching.rs:14:12 | LL | if let Ok(_) = Ok::<i32, i32>(42) {} | -------^^^^^--------------------- help: try this: `if Ok::<i32, i32>(42).is_ok()` @@ -7,67 +7,67 @@ LL | if let Ok(_) = Ok::<i32, i32>(42) {} = note: `-D clippy::redundant-pattern-matching` implied by `-D warnings` error: redundant pattern matching, consider using `is_err()` - --> $DIR/redundant_pattern_matching.rs:10:12 + --> $DIR/redundant_pattern_matching.rs:16:12 | LL | if let Err(_) = Err::<i32, i32>(42) {} | -------^^^^^^---------------------- help: try this: `if Err::<i32, i32>(42).is_err()` error: redundant pattern matching, consider using `is_none()` - --> $DIR/redundant_pattern_matching.rs:12:12 + --> $DIR/redundant_pattern_matching.rs:18:12 | LL | if let None = None::<()> {} | -------^^^^------------- help: try this: `if None::<()>.is_none()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:14:12 + --> $DIR/redundant_pattern_matching.rs:20:12 | LL | if let Some(_) = Some(42) {} | -------^^^^^^^----------- help: try this: `if Some(42).is_some()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:16:12 + --> $DIR/redundant_pattern_matching.rs:22:12 | LL | if let Some(_) = Some(42) { | -------^^^^^^^----------- help: try this: `if Some(42).is_some()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:22:15 + --> $DIR/redundant_pattern_matching.rs:28:15 | LL | while let Some(_) = Some(42) {} | ----------^^^^^^^----------- help: try this: `while Some(42).is_some()` error: redundant pattern matching, consider using `is_none()` - --> $DIR/redundant_pattern_matching.rs:24:15 + --> $DIR/redundant_pattern_matching.rs:30:15 | LL | while let None = Some(42) {} | ----------^^^^----------- help: try this: `while Some(42).is_none()` error: redundant pattern matching, consider using `is_none()` - --> $DIR/redundant_pattern_matching.rs:26:15 + --> $DIR/redundant_pattern_matching.rs:32:15 | LL | while let None = None::<()> {} | ----------^^^^------------- help: try this: `while None::<()>.is_none()` error: redundant pattern matching, consider using `is_ok()` - --> $DIR/redundant_pattern_matching.rs:28:15 + --> $DIR/redundant_pattern_matching.rs:34:15 | LL | while let Ok(_) = Ok::<i32, i32>(10) {} | ----------^^^^^--------------------- help: try this: `while Ok::<i32, i32>(10).is_ok()` error: redundant pattern matching, consider using `is_err()` - --> $DIR/redundant_pattern_matching.rs:30:15 + --> $DIR/redundant_pattern_matching.rs:36:15 | LL | while let Err(_) = Ok::<i32, i32>(10) {} | ----------^^^^^^--------------------- help: try this: `while Ok::<i32, i32>(10).is_err()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:33:15 + --> $DIR/redundant_pattern_matching.rs:39:15 | LL | while let Some(_) = v.pop() { | ----------^^^^^^^---------- help: try this: `while v.pop().is_some()` error: redundant pattern matching, consider using `is_ok()` - --> $DIR/redundant_pattern_matching.rs:49:5 + --> $DIR/redundant_pattern_matching.rs:55:5 | LL | / match Ok::<i32, i32>(42) { LL | | Ok(_) => true, @@ -76,7 +76,7 @@ LL | | }; | |_____^ help: try this: `Ok::<i32, i32>(42).is_ok()` error: redundant pattern matching, consider using `is_err()` - --> $DIR/redundant_pattern_matching.rs:54:5 + --> $DIR/redundant_pattern_matching.rs:60:5 | LL | / match Ok::<i32, i32>(42) { LL | | Ok(_) => false, @@ -85,7 +85,7 @@ LL | | }; | |_____^ help: try this: `Ok::<i32, i32>(42).is_err()` error: redundant pattern matching, consider using `is_err()` - --> $DIR/redundant_pattern_matching.rs:59:5 + --> $DIR/redundant_pattern_matching.rs:65:5 | LL | / match Err::<i32, i32>(42) { LL | | Ok(_) => false, @@ -94,7 +94,7 @@ LL | | }; | |_____^ help: try this: `Err::<i32, i32>(42).is_err()` error: redundant pattern matching, consider using `is_ok()` - --> $DIR/redundant_pattern_matching.rs:64:5 + --> $DIR/redundant_pattern_matching.rs:70:5 | LL | / match Err::<i32, i32>(42) { LL | | Ok(_) => true, @@ -103,7 +103,7 @@ LL | | }; | |_____^ help: try this: `Err::<i32, i32>(42).is_ok()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:69:5 + --> $DIR/redundant_pattern_matching.rs:75:5 | LL | / match Some(42) { LL | | Some(_) => true, @@ -112,7 +112,7 @@ LL | | }; | |_____^ help: try this: `Some(42).is_some()` error: redundant pattern matching, consider using `is_none()` - --> $DIR/redundant_pattern_matching.rs:74:5 + --> $DIR/redundant_pattern_matching.rs:80:5 | LL | / match None::<()> { LL | | Some(_) => false, @@ -121,7 +121,7 @@ LL | | }; | |_____^ help: try this: `None::<()>.is_none()` error: redundant pattern matching, consider using `is_none()` - --> $DIR/redundant_pattern_matching.rs:79:13 + --> $DIR/redundant_pattern_matching.rs:85:13 | LL | let _ = match None::<()> { | _____________^ @@ -131,61 +131,61 @@ LL | | }; | |_____^ help: try this: `None::<()>.is_none()` error: redundant pattern matching, consider using `is_ok()` - --> $DIR/redundant_pattern_matching.rs:84:20 + --> $DIR/redundant_pattern_matching.rs:90:20 | LL | let _ = if let Ok(_) = Ok::<usize, ()>(4) { true } else { false }; | -------^^^^^--------------------- help: try this: `if Ok::<usize, ()>(4).is_ok()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:87:20 + --> $DIR/redundant_pattern_matching.rs:93:20 | LL | let x = if let Some(_) = opt { true } else { false }; | -------^^^^^^^------ help: try this: `if opt.is_some()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:93:20 + --> $DIR/redundant_pattern_matching.rs:99:20 | LL | let _ = if let Some(_) = gen_opt() { | -------^^^^^^^------------ help: try this: `if gen_opt().is_some()` error: redundant pattern matching, consider using `is_none()` - --> $DIR/redundant_pattern_matching.rs:95:19 + --> $DIR/redundant_pattern_matching.rs:101:19 | LL | } else if let None = gen_opt() { | -------^^^^------------ help: try this: `if gen_opt().is_none()` error: redundant pattern matching, consider using `is_ok()` - --> $DIR/redundant_pattern_matching.rs:97:19 + --> $DIR/redundant_pattern_matching.rs:103:19 | LL | } else if let Ok(_) = gen_res() { | -------^^^^^------------ help: try this: `if gen_res().is_ok()` error: redundant pattern matching, consider using `is_err()` - --> $DIR/redundant_pattern_matching.rs:99:19 + --> $DIR/redundant_pattern_matching.rs:105:19 | LL | } else if let Err(_) = gen_res() { | -------^^^^^^------------ help: try this: `if gen_res().is_err()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:132:19 + --> $DIR/redundant_pattern_matching.rs:138:19 | LL | while let Some(_) = r#try!(result_opt()) {} | ----------^^^^^^^----------------------- help: try this: `while r#try!(result_opt()).is_some()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:133:16 + --> $DIR/redundant_pattern_matching.rs:139:16 | LL | if let Some(_) = r#try!(result_opt()) {} | -------^^^^^^^----------------------- help: try this: `if r#try!(result_opt()).is_some()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:139:12 + --> $DIR/redundant_pattern_matching.rs:145:12 | LL | if let Some(_) = m!() {} | -------^^^^^^^------- help: try this: `if m!().is_some()` error: redundant pattern matching, consider using `is_some()` - --> $DIR/redundant_pattern_matching.rs:140:15 + --> $DIR/redundant_pattern_matching.rs:146:15 | LL | while let Some(_) = m!() {} | ----------^^^^^^^------- help: try this: `while m!().is_some()` diff --git a/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.fixed b/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.fixed index 8a81e92f04a..de3fe00d5fa 100644 --- a/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.fixed +++ b/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.fixed @@ -2,7 +2,7 @@ #![feature(const_result)] #![warn(clippy::redundant_pattern_matching)] -#![allow(unused)] +#![allow(clippy::match_like_matches_macro, unused)] // Test that results are linted with the feature enabled. diff --git a/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.rs b/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.rs index 1cd515441d1..b77969d53d9 100644 --- a/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.rs +++ b/src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.rs @@ -2,7 +2,7 @@ #![feature(const_result)] #![warn(clippy::redundant_pattern_matching)] -#![allow(unused)] +#![allow(clippy::match_like_matches_macro, unused)] // Test that results are linted with the feature enabled. diff --git a/src/tools/clippy/tests/ui/regex.rs b/src/tools/clippy/tests/ui/regex.rs index b523fa5b711..9767e5bf76a 100644 --- a/src/tools/clippy/tests/ui/regex.rs +++ b/src/tools/clippy/tests/ui/regex.rs @@ -1,5 +1,5 @@ #![allow(unused)] -#![warn(clippy::invalid_regex, clippy::trivial_regex, clippy::regex_macro)] +#![warn(clippy::invalid_regex, clippy::trivial_regex)] extern crate regex; diff --git a/src/tools/clippy/tests/ui/repeat_once.fixed b/src/tools/clippy/tests/ui/repeat_once.fixed new file mode 100644 index 00000000000..a637c22fbcd --- /dev/null +++ b/src/tools/clippy/tests/ui/repeat_once.fixed @@ -0,0 +1,16 @@ +// run-rustfix +#![warn(clippy::repeat_once)] +#[allow(unused, clippy::many_single_char_names, clippy::redundant_clone)] +fn main() { + const N: usize = 1; + let s = "str"; + let string = "String".to_string(); + let slice = [1; 5]; + + let a = [1; 5].to_vec(); + let b = slice.to_vec(); + let c = "hello".to_string(); + let d = "hi".to_string(); + let e = s.to_string(); + let f = string.clone(); +} diff --git a/src/tools/clippy/tests/ui/repeat_once.rs b/src/tools/clippy/tests/ui/repeat_once.rs new file mode 100644 index 00000000000..d99ca1b5b55 --- /dev/null +++ b/src/tools/clippy/tests/ui/repeat_once.rs @@ -0,0 +1,16 @@ +// run-rustfix +#![warn(clippy::repeat_once)] +#[allow(unused, clippy::many_single_char_names, clippy::redundant_clone)] +fn main() { + const N: usize = 1; + let s = "str"; + let string = "String".to_string(); + let slice = [1; 5]; + + let a = [1; 5].repeat(1); + let b = slice.repeat(1); + let c = "hello".repeat(N); + let d = "hi".repeat(1); + let e = s.repeat(1); + let f = string.repeat(1); +} diff --git a/src/tools/clippy/tests/ui/repeat_once.stderr b/src/tools/clippy/tests/ui/repeat_once.stderr new file mode 100644 index 00000000000..915eea3bfc6 --- /dev/null +++ b/src/tools/clippy/tests/ui/repeat_once.stderr @@ -0,0 +1,40 @@ +error: calling `repeat(1)` on slice + --> $DIR/repeat_once.rs:10:13 + | +LL | let a = [1; 5].repeat(1); + | ^^^^^^^^^^^^^^^^ help: consider using `.to_vec()` instead: `[1; 5].to_vec()` + | + = note: `-D clippy::repeat-once` implied by `-D warnings` + +error: calling `repeat(1)` on slice + --> $DIR/repeat_once.rs:11:13 + | +LL | let b = slice.repeat(1); + | ^^^^^^^^^^^^^^^ help: consider using `.to_vec()` instead: `slice.to_vec()` + +error: calling `repeat(1)` on str + --> $DIR/repeat_once.rs:12:13 + | +LL | let c = "hello".repeat(N); + | ^^^^^^^^^^^^^^^^^ help: consider using `.to_string()` instead: `"hello".to_string()` + +error: calling `repeat(1)` on str + --> $DIR/repeat_once.rs:13:13 + | +LL | let d = "hi".repeat(1); + | ^^^^^^^^^^^^^^ help: consider using `.to_string()` instead: `"hi".to_string()` + +error: calling `repeat(1)` on str + --> $DIR/repeat_once.rs:14:13 + | +LL | let e = s.repeat(1); + | ^^^^^^^^^^^ help: consider using `.to_string()` instead: `s.to_string()` + +error: calling `repeat(1)` on a string literal + --> $DIR/repeat_once.rs:15:13 + | +LL | let f = string.repeat(1); + | ^^^^^^^^^^^^^^^^ help: consider using `.clone()` instead: `string.clone()` + +error: aborting due to 6 previous errors + diff --git a/src/tools/clippy/tests/ui/single_match_else.rs b/src/tools/clippy/tests/ui/single_match_else.rs index 34193be0b75..b624a41a29b 100644 --- a/src/tools/clippy/tests/ui/single_match_else.rs +++ b/src/tools/clippy/tests/ui/single_match_else.rs @@ -1,4 +1,6 @@ #![warn(clippy::single_match_else)] +#![allow(clippy::needless_return)] +#![allow(clippy::no_effect)] enum ExprNode { ExprAddrOf, @@ -30,6 +32,55 @@ macro_rules! unwrap_addr { }; } +#[rustfmt::skip] fn main() { unwrap_addr!(ExprNode::Unicorns); + + // + // don't lint single exprs/statements + // + + // don't lint here + match Some(1) { + Some(a) => println!("${:?}", a), + None => return, + } + + // don't lint here + match Some(1) { + Some(a) => println!("${:?}", a), + None => { + return + }, + } + + // don't lint here + match Some(1) { + Some(a) => println!("${:?}", a), + None => { + return; + }, + } + + // + // lint multiple exprs/statements "else" blocks + // + + // lint here + match Some(1) { + Some(a) => println!("${:?}", a), + None => { + println!("else block"); + return + }, + } + + // lint here + match Some(1) { + Some(a) => println!("${:?}", a), + None => { + println!("else block"); + return; + }, + } } diff --git a/src/tools/clippy/tests/ui/single_match_else.stderr b/src/tools/clippy/tests/ui/single_match_else.stderr index 59861d46eb3..3a07c2ec542 100644 --- a/src/tools/clippy/tests/ui/single_match_else.stderr +++ b/src/tools/clippy/tests/ui/single_match_else.stderr @@ -1,5 +1,5 @@ error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let` - --> $DIR/single_match_else.rs:12:5 + --> $DIR/single_match_else.rs:14:5 | LL | / match ExprNode::Butterflies { LL | | ExprNode::ExprAddrOf => Some(&NODE), @@ -19,5 +19,45 @@ LL | None LL | } | -error: aborting due to previous error +error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let` + --> $DIR/single_match_else.rs:70:5 + | +LL | / match Some(1) { +LL | | Some(a) => println!("${:?}", a), +LL | | None => { +LL | | println!("else block"); +LL | | return +LL | | }, +LL | | } + | |_____^ + | +help: try this + | +LL | if let Some(a) = Some(1) { println!("${:?}", a) } else { +LL | println!("else block"); +LL | return +LL | } + | + +error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let` + --> $DIR/single_match_else.rs:79:5 + | +LL | / match Some(1) { +LL | | Some(a) => println!("${:?}", a), +LL | | None => { +LL | | println!("else block"); +LL | | return; +LL | | }, +LL | | } + | |_____^ + | +help: try this + | +LL | if let Some(a) = Some(1) { println!("${:?}", a) } else { +LL | println!("else block"); +LL | return; +LL | } + | + +error: aborting due to 3 previous errors diff --git a/src/tools/clippy/tests/ui/type_repetition_in_bounds.rs b/src/tools/clippy/tests/ui/type_repetition_in_bounds.rs index 8b538be762b..766190f2099 100644 --- a/src/tools/clippy/tests/ui/type_repetition_in_bounds.rs +++ b/src/tools/clippy/tests/ui/type_repetition_in_bounds.rs @@ -1,4 +1,6 @@ -#[deny(clippy::type_repetition_in_bounds)] +#![deny(clippy::type_repetition_in_bounds)] + +use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign}; pub fn foo<T>(_t: T) where @@ -16,4 +18,55 @@ where unimplemented!(); } +// Threshold test (see #4380) +trait LintBounds +where + Self: Clone, + Self: Copy + Default + Ord, + Self: Add<Output = Self> + AddAssign + Sub<Output = Self> + SubAssign, + Self: Mul<Output = Self> + MulAssign + Div<Output = Self> + DivAssign, +{ +} + +trait LotsOfBounds +where + Self: Clone + Copy + Default + Ord, + Self: Add<Output = Self> + AddAssign + Sub<Output = Self> + SubAssign, + Self: Mul<Output = Self> + MulAssign + Div<Output = Self> + DivAssign, +{ +} + +// Generic distinction (see #4323) +mod issue4323 { + pub struct Foo<A>(A); + pub struct Bar<A, B> { + a: Foo<A>, + b: Foo<B>, + } + + impl<A, B> Unpin for Bar<A, B> + where + Foo<A>: Unpin, + Foo<B>: Unpin, + { + } +} + +// Extern macros shouldn't lint (see #4326) +extern crate serde; +mod issue4326 { + use serde::{Deserialize, Serialize}; + + trait Foo {} + impl Foo for String {} + + #[derive(Debug, Serialize, Deserialize)] + struct Bar<S> + where + S: Foo, + { + foo: S, + } +} + fn main() {} diff --git a/src/tools/clippy/tests/ui/type_repetition_in_bounds.stderr b/src/tools/clippy/tests/ui/type_repetition_in_bounds.stderr index 4264e2e10bf..148c19c7d07 100644 --- a/src/tools/clippy/tests/ui/type_repetition_in_bounds.stderr +++ b/src/tools/clippy/tests/ui/type_repetition_in_bounds.stderr @@ -1,15 +1,23 @@ error: this type has already been used as a bound predicate - --> $DIR/type_repetition_in_bounds.rs:6:5 + --> $DIR/type_repetition_in_bounds.rs:8:5 | LL | T: Clone, | ^^^^^^^^ | note: the lint level is defined here - --> $DIR/type_repetition_in_bounds.rs:1:8 + --> $DIR/type_repetition_in_bounds.rs:1:9 | -LL | #[deny(clippy::type_repetition_in_bounds)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | #![deny(clippy::type_repetition_in_bounds)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: consider combining the bounds: `T: Copy + Clone` -error: aborting due to previous error +error: this type has already been used as a bound predicate + --> $DIR/type_repetition_in_bounds.rs:25:5 + | +LL | Self: Copy + Default + Ord, + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider combining the bounds: `Self: Clone + Copy + Default + Ord` + +error: aborting due to 2 previous errors diff --git a/src/tools/clippy/tests/ui/unnecessary_clone.rs b/src/tools/clippy/tests/ui/unnecessary_clone.rs index f1cc5b564c1..2c9d4d39e6c 100644 --- a/src/tools/clippy/tests/ui/unnecessary_clone.rs +++ b/src/tools/clippy/tests/ui/unnecessary_clone.rs @@ -13,31 +13,6 @@ impl SomeTrait for SomeImpl {} fn main() {} -fn is_ascii(ch: char) -> bool { - ch.is_ascii() -} - -fn clone_on_copy() { - 42.clone(); - - vec![1].clone(); // ok, not a Copy type - Some(vec![1]).clone(); // ok, not a Copy type - (&42).clone(); - - let rc = RefCell::new(0); - rc.borrow().clone(); - - // Issue #4348 - let mut x = 43; - let _ = &x.clone(); // ok, getting a ref - 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate - is_ascii('z'.clone()); - - // Issue #5436 - let mut vec = Vec::new(); - vec.push(42.clone()); -} - fn clone_on_ref_ptr() { let rc = Rc::new(true); let arc = Arc::new(true); diff --git a/src/tools/clippy/tests/ui/unnecessary_clone.stderr b/src/tools/clippy/tests/ui/unnecessary_clone.stderr index 6176a2bc464..113fab69009 100644 --- a/src/tools/clippy/tests/ui/unnecessary_clone.stderr +++ b/src/tools/clippy/tests/ui/unnecessary_clone.stderr @@ -1,37 +1,5 @@ -error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:21:5 - | -LL | 42.clone(); - | ^^^^^^^^^^ help: try removing the `clone` call: `42` - | - = note: `-D clippy::clone-on-copy` implied by `-D warnings` - -error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:25:5 - | -LL | (&42).clone(); - | ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)` - -error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:28:5 - | -LL | rc.borrow().clone(); - | ^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*rc.borrow()` - -error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:34:14 - | -LL | is_ascii('z'.clone()); - | ^^^^^^^^^^^ help: try removing the `clone` call: `'z'` - -error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:38:14 - | -LL | vec.push(42.clone()); - | ^^^^^^^^^^ help: try removing the `clone` call: `42` - error: using `.clone()` on a ref-counted pointer - --> $DIR/unnecessary_clone.rs:48:5 + --> $DIR/unnecessary_clone.rs:23:5 | LL | rc.clone(); | ^^^^^^^^^^ help: try this: `Rc::<bool>::clone(&rc)` @@ -39,43 +7,45 @@ LL | rc.clone(); = note: `-D clippy::clone-on-ref-ptr` implied by `-D warnings` error: using `.clone()` on a ref-counted pointer - --> $DIR/unnecessary_clone.rs:51:5 + --> $DIR/unnecessary_clone.rs:26:5 | LL | arc.clone(); | ^^^^^^^^^^^ help: try this: `Arc::<bool>::clone(&arc)` error: using `.clone()` on a ref-counted pointer - --> $DIR/unnecessary_clone.rs:54:5 + --> $DIR/unnecessary_clone.rs:29:5 | LL | rcweak.clone(); | ^^^^^^^^^^^^^^ help: try this: `Weak::<bool>::clone(&rcweak)` error: using `.clone()` on a ref-counted pointer - --> $DIR/unnecessary_clone.rs:57:5 + --> $DIR/unnecessary_clone.rs:32:5 | LL | arc_weak.clone(); | ^^^^^^^^^^^^^^^^ help: try this: `Weak::<bool>::clone(&arc_weak)` error: using `.clone()` on a ref-counted pointer - --> $DIR/unnecessary_clone.rs:61:33 + --> $DIR/unnecessary_clone.rs:36:33 | LL | let _: Arc<dyn SomeTrait> = x.clone(); | ^^^^^^^^^ help: try this: `Arc::<SomeImpl>::clone(&x)` error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:65:5 + --> $DIR/unnecessary_clone.rs:40:5 | LL | t.clone(); | ^^^^^^^^^ help: try removing the `clone` call: `t` + | + = note: `-D clippy::clone-on-copy` implied by `-D warnings` error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:67:5 + --> $DIR/unnecessary_clone.rs:42:5 | LL | Some(t).clone(); | ^^^^^^^^^^^^^^^ help: try removing the `clone` call: `Some(t)` error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type - --> $DIR/unnecessary_clone.rs:73:22 + --> $DIR/unnecessary_clone.rs:48:22 | LL | let z: &Vec<_> = y.clone(); | ^^^^^^^^^ @@ -91,13 +61,13 @@ LL | let z: &Vec<_> = <&std::vec::Vec<i32>>::clone(y); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: using `clone` on a `Copy` type - --> $DIR/unnecessary_clone.rs:109:20 + --> $DIR/unnecessary_clone.rs:84:20 | LL | let _: E = a.clone(); | ^^^^^^^^^ help: try dereferencing it: `*****a` error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type - --> $DIR/unnecessary_clone.rs:114:22 + --> $DIR/unnecessary_clone.rs:89:22 | LL | let _ = &mut encoded.clone(); | ^^^^^^^^^^^^^^^ @@ -112,7 +82,7 @@ LL | let _ = &mut <&[u8]>::clone(encoded); | ^^^^^^^^^^^^^^^^^^^^^^^ error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type - --> $DIR/unnecessary_clone.rs:115:18 + --> $DIR/unnecessary_clone.rs:90:18 | LL | let _ = &encoded.clone(); | ^^^^^^^^^^^^^^^ @@ -126,5 +96,5 @@ help: or try being explicit if you are sure, that you want to clone a reference LL | let _ = &<&[u8]>::clone(encoded); | ^^^^^^^^^^^^^^^^^^^^^^^ -error: aborting due to 16 previous errors +error: aborting due to 11 previous errors diff --git a/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed b/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed index 779fd57707a..c017d1cf9a4 100644 --- a/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed +++ b/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed @@ -2,11 +2,11 @@ use std::cmp::Reverse; -fn id(x: isize) -> isize { - x -} +fn unnecessary_sort_by() { + fn id(x: isize) -> isize { + x + } -fn main() { let mut vec: Vec<isize> = vec![3, 6, 1, 2, 5]; // Forward examples vec.sort(); @@ -24,3 +24,41 @@ fn main() { vec.sort_by(|_, b| b.cmp(c)); vec.sort_unstable_by(|a, _| a.cmp(c)); } + +// Should not be linted to avoid hitting https://github.com/rust-lang/rust/issues/34162 +mod issue_5754 { + struct Test(String); + + #[derive(PartialOrd, Ord, PartialEq, Eq)] + struct Wrapper<'a>(&'a str); + + impl Test { + fn name(&self) -> &str { + &self.0 + } + + fn wrapped(&self) -> Wrapper<'_> { + Wrapper(&self.0) + } + } + + pub fn test() { + let mut args: Vec<Test> = vec![]; + + // Forward + args.sort_by(|a, b| a.name().cmp(b.name())); + args.sort_by(|a, b| a.wrapped().cmp(&b.wrapped())); + args.sort_unstable_by(|a, b| a.name().cmp(b.name())); + args.sort_unstable_by(|a, b| a.wrapped().cmp(&b.wrapped())); + // Reverse + args.sort_by(|a, b| b.name().cmp(a.name())); + args.sort_by(|a, b| b.wrapped().cmp(&a.wrapped())); + args.sort_unstable_by(|a, b| b.name().cmp(a.name())); + args.sort_unstable_by(|a, b| b.wrapped().cmp(&a.wrapped())); + } +} + +fn main() { + unnecessary_sort_by(); + issue_5754::test(); +} diff --git a/src/tools/clippy/tests/ui/unnecessary_sort_by.rs b/src/tools/clippy/tests/ui/unnecessary_sort_by.rs index 0485a5630af..1929c72b2f2 100644 --- a/src/tools/clippy/tests/ui/unnecessary_sort_by.rs +++ b/src/tools/clippy/tests/ui/unnecessary_sort_by.rs @@ -2,11 +2,11 @@ use std::cmp::Reverse; -fn id(x: isize) -> isize { - x -} +fn unnecessary_sort_by() { + fn id(x: isize) -> isize { + x + } -fn main() { let mut vec: Vec<isize> = vec![3, 6, 1, 2, 5]; // Forward examples vec.sort_by(|a, b| a.cmp(b)); @@ -24,3 +24,41 @@ fn main() { vec.sort_by(|_, b| b.cmp(c)); vec.sort_unstable_by(|a, _| a.cmp(c)); } + +// Should not be linted to avoid hitting https://github.com/rust-lang/rust/issues/34162 +mod issue_5754 { + struct Test(String); + + #[derive(PartialOrd, Ord, PartialEq, Eq)] + struct Wrapper<'a>(&'a str); + + impl Test { + fn name(&self) -> &str { + &self.0 + } + + fn wrapped(&self) -> Wrapper<'_> { + Wrapper(&self.0) + } + } + + pub fn test() { + let mut args: Vec<Test> = vec![]; + + // Forward + args.sort_by(|a, b| a.name().cmp(b.name())); + args.sort_by(|a, b| a.wrapped().cmp(&b.wrapped())); + args.sort_unstable_by(|a, b| a.name().cmp(b.name())); + args.sort_unstable_by(|a, b| a.wrapped().cmp(&b.wrapped())); + // Reverse + args.sort_by(|a, b| b.name().cmp(a.name())); + args.sort_by(|a, b| b.wrapped().cmp(&a.wrapped())); + args.sort_unstable_by(|a, b| b.name().cmp(a.name())); + args.sort_unstable_by(|a, b| b.wrapped().cmp(&a.wrapped())); + } +} + +fn main() { + unnecessary_sort_by(); + issue_5754::test(); +} diff --git a/src/tools/clippy/tests/ui/unnested_or_patterns3.rs b/src/tools/clippy/tests/ui/unnested_or_patterns3.rs new file mode 100644 index 00000000000..6bd35057bfa --- /dev/null +++ b/src/tools/clippy/tests/ui/unnested_or_patterns3.rs @@ -0,0 +1,6 @@ +#![warn(clippy::unnested_or_patterns)] + +// Test that `unnested_or_patterns` does not trigger without enabling `or_patterns` +fn main() { + if let (0, 1) | (0, 2) | (0, 3) = (0, 0) {} +} |