diff options
| -rw-r--r-- | clippy_utils/src/lib.rs | 47 | ||||
| -rw-r--r-- | tests/ui/map_identity.fixed | 64 | ||||
| -rw-r--r-- | tests/ui/map_identity.rs | 64 | ||||
| -rw-r--r-- | tests/ui/map_identity.stderr | 38 |
4 files changed, 200 insertions, 13 deletions
diff --git a/clippy_utils/src/lib.rs b/clippy_utils/src/lib.rs index d8dd767d2e1..a14ea72ba0c 100644 --- a/clippy_utils/src/lib.rs +++ b/clippy_utils/src/lib.rs @@ -84,7 +84,7 @@ pub use self::hir_utils::{ use core::mem; use core::ops::ControlFlow; use std::collections::hash_map::Entry; -use std::iter::{once, repeat_n}; +use std::iter::{once, repeat_n, zip}; use std::sync::{Mutex, MutexGuard, OnceLock}; use itertools::Itertools; @@ -582,7 +582,7 @@ pub fn can_mut_borrow_both(cx: &LateContext<'_>, e1: &Expr<'_>, e2: &Expr<'_>) - return false; } - for (x1, x2) in s1.iter().zip(s2.iter()) { + for (x1, x2) in zip(&s1, &s2) { if expr_custom_deref_adjustment(cx, x1).is_some() || expr_custom_deref_adjustment(cx, x2).is_some() { return false; } @@ -1898,6 +1898,8 @@ pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { /// * `|x| { return x; }` /// * `|(x, y)| (x, y)` /// * `|[x, y]| [x, y]` +/// * `|Foo(bar, baz)| Foo(bar, baz)` +/// * `|Foo { bar, baz }| Foo { bar, baz }` /// /// Consider calling [`is_expr_untyped_identity_function`] or [`is_expr_identity_function`] instead. fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool { @@ -1942,6 +1944,8 @@ fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool { /// * `x` is the identity representation of `x` /// * `(x, y)` is the identity representation of `(x, y)` /// * `[x, y]` is the identity representation of `[x, y]` +/// * `Foo(bar, baz)` is the identity representation of `Foo(bar, baz)` +/// * `Foo { bar, baz }` is the identity representation of `Foo { bar, baz }` /// /// Note that `by_hir` is used to determine bindings are checked by their `HirId` or by their name. /// This can be useful when checking patterns in `let` bindings or `match` arms. @@ -1958,6 +1962,9 @@ pub fn is_expr_identity_of_pat(cx: &LateContext<'_>, pat: &Pat<'_>, expr: &Expr< return false; } + // NOTE: we're inside a (function) body, so this won't ICE + let qpath_res = |qpath, hir| cx.typeck_results().qpath_res(qpath, hir); + match (pat.kind, expr.kind) { (PatKind::Binding(_, id, _, _), _) if by_hir => { path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty() @@ -1968,16 +1975,36 @@ pub fn is_expr_identity_of_pat(cx: &LateContext<'_>, pat: &Pat<'_>, expr: &Expr< (PatKind::Tuple(pats, dotdot), ExprKind::Tup(tup)) if dotdot.as_opt_usize().is_none() && pats.len() == tup.len() => { - pats.iter() - .zip(tup) - .all(|(pat, expr)| is_expr_identity_of_pat(cx, pat, expr, by_hir)) + zip(pats, tup).all(|(pat, expr)| is_expr_identity_of_pat(cx, pat, expr, by_hir)) + }, + (PatKind::Slice(before, None, after), ExprKind::Array(arr)) if before.len() + after.len() == arr.len() => { + zip(before.iter().chain(after), arr).all(|(pat, expr)| is_expr_identity_of_pat(cx, pat, expr, by_hir)) }, - (PatKind::Slice(before, slice, after), ExprKind::Array(arr)) - if slice.is_none() && before.len() + after.len() == arr.len() => + (PatKind::TupleStruct(pat_ident, field_pats, dotdot), ExprKind::Call(ident, fields)) + if dotdot.as_opt_usize().is_none() && field_pats.len() == fields.len() => { - (before.iter().chain(after)) - .zip(arr) - .all(|(pat, expr)| is_expr_identity_of_pat(cx, pat, expr, by_hir)) + // check ident + if let ExprKind::Path(ident) = &ident.kind + && qpath_res(&pat_ident, pat.hir_id) == qpath_res(ident, expr.hir_id) + // check fields + && zip(field_pats, fields).all(|(pat, expr)| is_expr_identity_of_pat(cx, pat, expr,by_hir)) + { + true + } else { + false + } + }, + (PatKind::Struct(pat_ident, field_pats, false), ExprKind::Struct(ident, fields, hir::StructTailExpr::None)) + if field_pats.len() == fields.len() => + { + // check ident + qpath_res(&pat_ident, pat.hir_id) == qpath_res(ident, expr.hir_id) + // check fields + && field_pats.iter().all(|field_pat| { + fields.iter().any(|field| { + field_pat.ident == field.ident && is_expr_identity_of_pat(cx, field_pat.pat, field.expr, by_hir) + }) + }) }, _ => false, } diff --git a/tests/ui/map_identity.fixed b/tests/ui/map_identity.fixed index b82d3e6d956..6c971ba6338 100644 --- a/tests/ui/map_identity.fixed +++ b/tests/ui/map_identity.fixed @@ -1,5 +1,5 @@ #![warn(clippy::map_identity)] -#![allow(clippy::needless_return)] +#![allow(clippy::needless_return, clippy::disallowed_names)] fn main() { let x: [u16; 3] = [1, 2, 3]; @@ -99,3 +99,65 @@ fn issue15198() { let _ = x.iter().copied(); //~^ map_identity } + +mod foo { + #[derive(Clone, Copy)] + pub struct Foo { + pub foo: u8, + pub bar: u8, + } + + #[derive(Clone, Copy)] + pub struct Foo2(pub u8, pub u8); +} +use foo::{Foo, Foo2}; + +struct Bar { + foo: u8, + bar: u8, +} + +struct Bar2(u8, u8); + +fn structs() { + let x = [Foo { foo: 0, bar: 0 }]; + + let _ = x.into_iter(); + //~^ map_identity + + // still lint when different paths are used for the same struct + let _ = x.into_iter(); + //~^ map_identity + + // don't lint: same fields but different structs + let _ = x.into_iter().map(|Foo { foo, bar }| Bar { foo, bar }); + + // still lint with redundant field names + #[allow(clippy::redundant_field_names)] + let _ = x.into_iter(); + //~^ map_identity + + // still lint with field order change + let _ = x.into_iter(); + //~^ map_identity + + // don't lint: switched field assignment + let _ = x.into_iter().map(|Foo { foo, bar }| Foo { foo: bar, bar: foo }); +} + +fn tuple_structs() { + let x = [Foo2(0, 0)]; + + let _ = x.into_iter(); + //~^ map_identity + + // still lint when different paths are used for the same struct + let _ = x.into_iter(); + //~^ map_identity + + // don't lint: same fields but different structs + let _ = x.into_iter().map(|Foo2(foo, bar)| Bar2(foo, bar)); + + // don't lint: switched field assignment + let _ = x.into_iter().map(|Foo2(foo, bar)| Foo2(bar, foo)); +} diff --git a/tests/ui/map_identity.rs b/tests/ui/map_identity.rs index c295bf87270..59dcfcda3b6 100644 --- a/tests/ui/map_identity.rs +++ b/tests/ui/map_identity.rs @@ -1,5 +1,5 @@ #![warn(clippy::map_identity)] -#![allow(clippy::needless_return)] +#![allow(clippy::needless_return, clippy::disallowed_names)] fn main() { let x: [u16; 3] = [1, 2, 3]; @@ -105,3 +105,65 @@ fn issue15198() { let _ = x.iter().copied().map(|[x, y]| [x, y]); //~^ map_identity } + +mod foo { + #[derive(Clone, Copy)] + pub struct Foo { + pub foo: u8, + pub bar: u8, + } + + #[derive(Clone, Copy)] + pub struct Foo2(pub u8, pub u8); +} +use foo::{Foo, Foo2}; + +struct Bar { + foo: u8, + bar: u8, +} + +struct Bar2(u8, u8); + +fn structs() { + let x = [Foo { foo: 0, bar: 0 }]; + + let _ = x.into_iter().map(|Foo { foo, bar }| Foo { foo, bar }); + //~^ map_identity + + // still lint when different paths are used for the same struct + let _ = x.into_iter().map(|Foo { foo, bar }| foo::Foo { foo, bar }); + //~^ map_identity + + // don't lint: same fields but different structs + let _ = x.into_iter().map(|Foo { foo, bar }| Bar { foo, bar }); + + // still lint with redundant field names + #[allow(clippy::redundant_field_names)] + let _ = x.into_iter().map(|Foo { foo, bar }| Foo { foo: foo, bar: bar }); + //~^ map_identity + + // still lint with field order change + let _ = x.into_iter().map(|Foo { foo, bar }| Foo { bar, foo }); + //~^ map_identity + + // don't lint: switched field assignment + let _ = x.into_iter().map(|Foo { foo, bar }| Foo { foo: bar, bar: foo }); +} + +fn tuple_structs() { + let x = [Foo2(0, 0)]; + + let _ = x.into_iter().map(|Foo2(foo, bar)| Foo2(foo, bar)); + //~^ map_identity + + // still lint when different paths are used for the same struct + let _ = x.into_iter().map(|Foo2(foo, bar)| foo::Foo2(foo, bar)); + //~^ map_identity + + // don't lint: same fields but different structs + let _ = x.into_iter().map(|Foo2(foo, bar)| Bar2(foo, bar)); + + // don't lint: switched field assignment + let _ = x.into_iter().map(|Foo2(foo, bar)| Foo2(bar, foo)); +} diff --git a/tests/ui/map_identity.stderr b/tests/ui/map_identity.stderr index 9b624a0dc75..a50c0d6b87b 100644 --- a/tests/ui/map_identity.stderr +++ b/tests/ui/map_identity.stderr @@ -93,5 +93,41 @@ error: unnecessary map of the identity function LL | let _ = x.iter().copied().map(|[x, y]| [x, y]); | ^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` -error: aborting due to 14 previous errors +error: unnecessary map of the identity function + --> tests/ui/map_identity.rs:131:26 + | +LL | let _ = x.into_iter().map(|Foo { foo, bar }| Foo { foo, bar }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> tests/ui/map_identity.rs:135:26 + | +LL | let _ = x.into_iter().map(|Foo { foo, bar }| foo::Foo { foo, bar }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> tests/ui/map_identity.rs:143:26 + | +LL | let _ = x.into_iter().map(|Foo { foo, bar }| Foo { foo: foo, bar: bar }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> tests/ui/map_identity.rs:147:26 + | +LL | let _ = x.into_iter().map(|Foo { foo, bar }| Foo { bar, foo }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> tests/ui/map_identity.rs:157:26 + | +LL | let _ = x.into_iter().map(|Foo2(foo, bar)| Foo2(foo, bar)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: unnecessary map of the identity function + --> tests/ui/map_identity.rs:161:26 + | +LL | let _ = x.into_iter().map(|Foo2(foo, bar)| foo::Foo2(foo, bar)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the call to `map` + +error: aborting due to 20 previous errors |