diff options
59 files changed, 628 insertions, 61 deletions
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs index bcc2c29a2ff..9b46e7c46b6 100644 --- a/compiler/rustc_ast_lowering/src/lib.rs +++ b/compiler/rustc_ast_lowering/src/lib.rs @@ -837,7 +837,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { (hir::ParamName::Fresh, hir::LifetimeParamKind::Elided(kind)) } - LifetimeRes::Static | LifetimeRes::Error => return None, + LifetimeRes::Static { .. } | LifetimeRes::Error => return None, res => panic!( "Unexpected lifetime resolution {:?} for {:?} at {:?}", res, ident, ident.span @@ -1656,7 +1656,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { } // Opaques do not capture `'static` - LifetimeRes::Static | LifetimeRes::Error => { + LifetimeRes::Static { .. } | LifetimeRes::Error => { continue; } @@ -2069,7 +2069,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { hir::LifetimeName::Param(param) } LifetimeRes::Infer => hir::LifetimeName::Infer, - LifetimeRes::Static => hir::LifetimeName::Static, + LifetimeRes::Static { .. } => hir::LifetimeName::Static, LifetimeRes::Error => hir::LifetimeName::Error, res => panic!( "Unexpected lifetime resolution {:?} for {:?} at {:?}", diff --git a/compiler/rustc_ast_lowering/src/lifetime_collector.rs b/compiler/rustc_ast_lowering/src/lifetime_collector.rs index 77cc2a36a53..76c957afa54 100644 --- a/compiler/rustc_ast_lowering/src/lifetime_collector.rs +++ b/compiler/rustc_ast_lowering/src/lifetime_collector.rs @@ -27,7 +27,7 @@ impl<'ast> LifetimeCollectVisitor<'ast> { self.collected_lifetimes.insert(lifetime); } } - LifetimeRes::Static | LifetimeRes::Error => { + LifetimeRes::Static { .. } | LifetimeRes::Error => { self.collected_lifetimes.insert(lifetime); } LifetimeRes::Infer => {} diff --git a/compiler/rustc_hir/src/def.rs b/compiler/rustc_hir/src/def.rs index 36e29d2dcb2..c5dc4dacab6 100644 --- a/compiler/rustc_hir/src/def.rs +++ b/compiler/rustc_hir/src/def.rs @@ -863,8 +863,13 @@ pub enum LifetimeRes { /// This variant is used for anonymous lifetimes that we did not resolve during /// late resolution. Those lifetimes will be inferred by typechecking. Infer, - /// Explicit `'static` lifetime. - Static, + /// `'static` lifetime. + Static { + /// We do not want to emit `elided_named_lifetimes` + /// when we are inside of a const item or a static, + /// because it would get too annoying. + suppress_elision_warning: bool, + }, /// Resolution failure. Error, /// HACK: This is used to recover the NodeId of an elided lifetime. diff --git a/compiler/rustc_lint/messages.ftl b/compiler/rustc_lint/messages.ftl index 08a50050a36..31b7eb5ee7d 100644 --- a/compiler/rustc_lint/messages.ftl +++ b/compiler/rustc_lint/messages.ftl @@ -252,6 +252,10 @@ lint_duplicate_macro_attribute = lint_duplicate_matcher_binding = duplicate matcher binding +lint_elided_named_lifetime = elided lifetime has a name + .label_elided = this elided lifetime gets resolved as `{$name}` + .label_named = lifetime `{$name}` declared here + lint_enum_intrinsics_mem_discriminant = the return value of `mem::discriminant` is unspecified when called with a non-enum type .note = the argument to `discriminant` should be a reference to an enum, but it was passed a reference to a `{$ty_param}`, which is not an enum diff --git a/compiler/rustc_lint/src/context/diagnostics.rs b/compiler/rustc_lint/src/context/diagnostics.rs index f289d4c81b3..fd43afa1743 100644 --- a/compiler/rustc_lint/src/context/diagnostics.rs +++ b/compiler/rustc_lint/src/context/diagnostics.rs @@ -10,6 +10,7 @@ use rustc_errors::{ use rustc_middle::middle::stability; use rustc_session::lint::BuiltinLintDiag; use rustc_session::Session; +use rustc_span::symbol::kw; use rustc_span::BytePos; use tracing::debug; @@ -441,5 +442,17 @@ pub(super) fn decorate_lint(sess: &Session, diagnostic: BuiltinLintDiag, diag: & BuiltinLintDiag::UnexpectedBuiltinCfg { cfg, cfg_name, controlled_by } => { lints::UnexpectedBuiltinCfg { cfg, cfg_name, controlled_by }.decorate_lint(diag) } + BuiltinLintDiag::ElidedIsStatic { elided } => { + lints::ElidedNamedLifetime { elided, name: kw::StaticLifetime, named_declaration: None } + .decorate_lint(diag) + } + BuiltinLintDiag::ElidedIsParam { elided, param: (param_name, param_span) } => { + lints::ElidedNamedLifetime { + elided, + name: param_name, + named_declaration: Some(param_span), + } + .decorate_lint(diag) + } } } diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs index c6bcb1f3e83..2712e25668a 100644 --- a/compiler/rustc_lint/src/lints.rs +++ b/compiler/rustc_lint/src/lints.rs @@ -2612,6 +2612,16 @@ pub(crate) struct ElidedLifetimesInPaths { } #[derive(LintDiagnostic)] +#[diag(lint_elided_named_lifetime)] +pub(crate) struct ElidedNamedLifetime { + #[label(lint_label_elided)] + pub elided: Span, + pub name: Symbol, + #[label(lint_label_named)] + pub named_declaration: Option<Span>, +} + +#[derive(LintDiagnostic)] #[diag(lint_invalid_crate_type_value)] pub(crate) struct UnknownCrateTypes { #[subdiagnostic] diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs index 04fd7c9c627..7063f488209 100644 --- a/compiler/rustc_lint_defs/src/builtin.rs +++ b/compiler/rustc_lint_defs/src/builtin.rs @@ -42,6 +42,7 @@ declare_lint_pass! { DUPLICATE_MACRO_ATTRIBUTES, ELIDED_LIFETIMES_IN_ASSOCIATED_CONSTANT, ELIDED_LIFETIMES_IN_PATHS, + ELIDED_NAMED_LIFETIMES, EXPLICIT_BUILTIN_CFGS_IN_FLAGS, EXPORTED_PRIVATE_DEPENDENCIES, FFI_UNWIND_CALLS, @@ -1863,6 +1864,38 @@ declare_lint! { } declare_lint! { + /// The `elided_named_lifetimes` lint detects when an elided + /// lifetime ends up being a named lifetime, such as `'static` + /// or some lifetime parameter `'a`. + /// + /// ### Example + /// + /// ```rust,compile_fail + /// #![deny(elided_named_lifetimes)] + /// struct Foo; + /// impl Foo { + /// pub fn get_mut(&'static self, x: &mut u8) -> &mut u8 { + /// unsafe { &mut *(x as *mut _) } + /// } + /// } + /// ``` + /// + /// {{produces}} + /// + /// ### Explanation + /// + /// Lifetime elision is quite useful, because it frees you from having + /// to give each lifetime its own name, but sometimes it can produce + /// somewhat surprising resolutions. In safe code, it is mostly okay, + /// because the borrow checker prevents any unsoundness, so the worst + /// case scenario is you get a confusing error message in some other place. + /// But with `unsafe` code, such unexpected resolutions may lead to unsound code. + pub ELIDED_NAMED_LIFETIMES, + Warn, + "detects when an elided lifetime gets resolved to be `'static` or some named parameter" +} + +declare_lint! { /// The `bare_trait_objects` lint suggests using `dyn Trait` for trait /// objects. /// diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs index c17b85db3b0..8ddbff284cc 100644 --- a/compiler/rustc_lint_defs/src/lib.rs +++ b/compiler/rustc_lint_defs/src/lib.rs @@ -589,6 +589,13 @@ pub enum BuiltinLintDiag { }, MacroExpandedMacroExportsAccessedByAbsolutePaths(Span), ElidedLifetimesInPaths(usize, Span, bool, Span), + ElidedIsStatic { + elided: Span, + }, + ElidedIsParam { + elided: Span, + param: (Symbol, Span), + }, UnknownCrateTypes { span: Span, candidate: Option<Symbol>, diff --git a/compiler/rustc_resolve/src/late.rs b/compiler/rustc_resolve/src/late.rs index 40fdb01a72c..8ec0469ed6d 100644 --- a/compiler/rustc_resolve/src/late.rs +++ b/compiler/rustc_resolve/src/late.rs @@ -1557,14 +1557,14 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { if ident.name == kw::StaticLifetime { self.record_lifetime_res( lifetime.id, - LifetimeRes::Static, + LifetimeRes::Static { suppress_elision_warning: false }, LifetimeElisionCandidate::Named, ); return; } if ident.name == kw::UnderscoreLifetime { - return self.resolve_anonymous_lifetime(lifetime, false); + return self.resolve_anonymous_lifetime(lifetime, lifetime.id, false); } let mut lifetime_rib_iter = self.lifetime_ribs.iter().rev(); @@ -1667,13 +1667,23 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { } #[instrument(level = "debug", skip(self))] - fn resolve_anonymous_lifetime(&mut self, lifetime: &Lifetime, elided: bool) { + fn resolve_anonymous_lifetime( + &mut self, + lifetime: &Lifetime, + id_for_lint: NodeId, + elided: bool, + ) { debug_assert_eq!(lifetime.ident.name, kw::UnderscoreLifetime); let kind = if elided { MissingLifetimeKind::Ampersand } else { MissingLifetimeKind::Underscore }; - let missing_lifetime = - MissingLifetime { id: lifetime.id, span: lifetime.ident.span, kind, count: 1 }; + let missing_lifetime = MissingLifetime { + id: lifetime.id, + span: lifetime.ident.span, + kind, + count: 1, + id_for_lint, + }; let elision_candidate = LifetimeElisionCandidate::Missing(missing_lifetime); for (i, rib) in self.lifetime_ribs.iter().enumerate().rev() { debug!(?rib.kind); @@ -1697,7 +1707,8 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { if lifetimes_in_scope.is_empty() { self.record_lifetime_res( lifetime.id, - LifetimeRes::Static, + // We are inside a const item, so do not warn. + LifetimeRes::Static { suppress_elision_warning: true }, elision_candidate, ); return; @@ -1800,7 +1811,7 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { LifetimeRes::ElidedAnchor { start: id, end: NodeId::from_u32(id.as_u32() + 1) }, LifetimeElisionCandidate::Ignore, ); - self.resolve_anonymous_lifetime(<, true); + self.resolve_anonymous_lifetime(<, anchor_id, true); } #[instrument(level = "debug", skip(self))] @@ -1916,6 +1927,7 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { }; let missing_lifetime = MissingLifetime { id: node_ids.start, + id_for_lint: segment_id, span: elided_lifetime_span, kind, count: expected_lifetimes, @@ -2039,8 +2051,44 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { if let Some(prev_res) = self.r.lifetimes_res_map.insert(id, res) { panic!("lifetime {id:?} resolved multiple times ({prev_res:?} before, {res:?} now)") } + + match candidate { + LifetimeElisionCandidate::Missing(missing @ MissingLifetime { .. }) => { + debug_assert_eq!(id, missing.id); + match res { + LifetimeRes::Static { suppress_elision_warning } => { + if !suppress_elision_warning { + self.r.lint_buffer.buffer_lint( + lint::builtin::ELIDED_NAMED_LIFETIMES, + missing.id_for_lint, + missing.span, + BuiltinLintDiag::ElidedIsStatic { elided: missing.span }, + ); + } + } + LifetimeRes::Param { param, binder: _ } => { + let tcx = self.r.tcx(); + self.r.lint_buffer.buffer_lint( + lint::builtin::ELIDED_NAMED_LIFETIMES, + missing.id_for_lint, + missing.span, + BuiltinLintDiag::ElidedIsParam { + elided: missing.span, + param: (tcx.item_name(param.into()), tcx.source_span(param)), + }, + ); + } + LifetimeRes::Fresh { .. } + | LifetimeRes::Infer + | LifetimeRes::Error + | LifetimeRes::ElidedAnchor { .. } => {} + } + } + LifetimeElisionCandidate::Ignore | LifetimeElisionCandidate::Named => {} + } + match res { - LifetimeRes::Param { .. } | LifetimeRes::Fresh { .. } | LifetimeRes::Static => { + LifetimeRes::Param { .. } | LifetimeRes::Fresh { .. } | LifetimeRes::Static { .. } => { if let Some(ref mut candidates) = self.lifetime_elision_candidates { candidates.push((res, candidate)); } @@ -2558,9 +2606,14 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { ItemKind::Static(box ast::StaticItem { ref ty, ref expr, .. }) => { self.with_static_rib(def_kind, |this| { - this.with_lifetime_rib(LifetimeRibKind::Elided(LifetimeRes::Static), |this| { - this.visit_ty(ty); - }); + this.with_lifetime_rib( + LifetimeRibKind::Elided(LifetimeRes::Static { + suppress_elision_warning: true, + }), + |this| { + this.visit_ty(ty); + }, + ); if let Some(expr) = expr { // We already forbid generic params because of the above item rib, // so it doesn't matter whether this is a trivial constant. @@ -2589,7 +2642,9 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> { this.visit_generics(generics); this.with_lifetime_rib( - LifetimeRibKind::Elided(LifetimeRes::Static), + LifetimeRibKind::Elided(LifetimeRes::Static { + suppress_elision_warning: true, + }), |this| this.visit_ty(ty), ); diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs index f778b0ee3ac..8f516c2db09 100644 --- a/compiler/rustc_resolve/src/late/diagnostics.rs +++ b/compiler/rustc_resolve/src/late/diagnostics.rs @@ -102,6 +102,13 @@ fn import_candidate_to_enum_paths(suggestion: &ImportSuggestion) -> (String, Str pub(super) struct MissingLifetime { /// Used to overwrite the resolution with the suggestion, to avoid cascading errors. pub id: NodeId, + /// As we cannot yet emit lints in this crate and have to buffer them instead, + /// we need to associate each lint with some `NodeId`, + /// however for some `MissingLifetime`s their `NodeId`s are "fake", + /// in a sense that they are temporary and not get preserved down the line, + /// which means that the lints for those nodes will not get emitted. + /// To combat this, we can try to use some other `NodeId`s as a fallback option. + pub id_for_lint: NodeId, /// Where to suggest adding the lifetime. pub span: Span, /// How the lifetime was introduced, to have the correct space and comma. @@ -3028,7 +3035,7 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> { maybe_static = true; in_scope_lifetimes = vec![( Ident::with_dummy_span(kw::StaticLifetime), - (DUMMY_NODE_ID, LifetimeRes::Static), + (DUMMY_NODE_ID, LifetimeRes::Static { suppress_elision_warning: false }), )]; } } else if elided_len == 0 { @@ -3040,7 +3047,7 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> { maybe_static = true; in_scope_lifetimes = vec![( Ident::with_dummy_span(kw::StaticLifetime), - (DUMMY_NODE_ID, LifetimeRes::Static), + (DUMMY_NODE_ID, LifetimeRes::Static { suppress_elision_warning: false }), )]; } } else if num_params == 1 { diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs index e628be1546f..bc8b7e24bf1 100644 --- a/library/alloc/src/string.rs +++ b/library/alloc/src/string.rs @@ -2313,7 +2313,7 @@ impl<'b> Pattern for &'b String { } #[inline] - fn strip_suffix_of<'a>(self, haystack: &'a str) -> Option<&str> + fn strip_suffix_of<'a>(self, haystack: &'a str) -> Option<&'a str> where Self::Searcher<'a>: core::str::pattern::ReverseSearcher<'a>, { diff --git a/library/core/src/fmt/rt.rs b/library/core/src/fmt/rt.rs index f29ac99b292..eee4a9e4c6c 100644 --- a/library/core/src/fmt/rt.rs +++ b/library/core/src/fmt/rt.rs @@ -110,43 +110,43 @@ impl<'a> Argument<'a> { } #[inline(always)] - pub fn new_display<'b, T: Display>(x: &'b T) -> Argument<'_> { + pub fn new_display<'b, T: Display>(x: &'b T) -> Argument<'b> { Self::new(x, Display::fmt) } #[inline(always)] - pub fn new_debug<'b, T: Debug>(x: &'b T) -> Argument<'_> { + pub fn new_debug<'b, T: Debug>(x: &'b T) -> Argument<'b> { Self::new(x, Debug::fmt) } #[inline(always)] - pub fn new_debug_noop<'b, T: Debug>(x: &'b T) -> Argument<'_> { + pub fn new_debug_noop<'b, T: Debug>(x: &'b T) -> Argument<'b> { Self::new(x, |_, _| Ok(())) } #[inline(always)] - pub fn new_octal<'b, T: Octal>(x: &'b T) -> Argument<'_> { + pub fn new_octal<'b, T: Octal>(x: &'b T) -> Argument<'b> { Self::new(x, Octal::fmt) } #[inline(always)] - pub fn new_lower_hex<'b, T: LowerHex>(x: &'b T) -> Argument<'_> { + pub fn new_lower_hex<'b, T: LowerHex>(x: &'b T) -> Argument<'b> { Self::new(x, LowerHex::fmt) } #[inline(always)] - pub fn new_upper_hex<'b, T: UpperHex>(x: &'b T) -> Argument<'_> { + pub fn new_upper_hex<'b, T: UpperHex>(x: &'b T) -> Argument<'b> { Self::new(x, UpperHex::fmt) } #[inline(always)] - pub fn new_pointer<'b, T: Pointer>(x: &'b T) -> Argument<'_> { + pub fn new_pointer<'b, T: Pointer>(x: &'b T) -> Argument<'b> { Self::new(x, Pointer::fmt) } #[inline(always)] - pub fn new_binary<'b, T: Binary>(x: &'b T) -> Argument<'_> { + pub fn new_binary<'b, T: Binary>(x: &'b T) -> Argument<'b> { Self::new(x, Binary::fmt) } #[inline(always)] - pub fn new_lower_exp<'b, T: LowerExp>(x: &'b T) -> Argument<'_> { + pub fn new_lower_exp<'b, T: LowerExp>(x: &'b T) -> Argument<'b> { Self::new(x, LowerExp::fmt) } #[inline(always)] - pub fn new_upper_exp<'b, T: UpperExp>(x: &'b T) -> Argument<'_> { + pub fn new_upper_exp<'b, T: UpperExp>(x: &'b T) -> Argument<'b> { Self::new(x, UpperExp::fmt) } #[inline(always)] diff --git a/src/tools/clippy/tests/ui/needless_lifetimes.stderr b/src/tools/clippy/tests/ui/needless_lifetimes.stderr index f325d27b8c7..50f845e2d92 100644 --- a/src/tools/clippy/tests/ui/needless_lifetimes.stderr +++ b/src/tools/clippy/tests/ui/needless_lifetimes.stderr @@ -1,3 +1,14 @@ +error: elided lifetime has a name + --> tests/ui/needless_lifetimes.rs:266:52 + | +LL | fn named_input_elided_output<'a>(_arg: &'a str) -> &str { + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + | + = note: `-D elided-named-lifetimes` implied by `-D warnings` + = help: to override `-D warnings` add `#[allow(elided_named_lifetimes)]` + error: the following explicit lifetimes could be elided: 'a, 'b --> tests/ui/needless_lifetimes.rs:17:23 | @@ -553,5 +564,5 @@ LL - fn one_input<'a>(x: &'a u8) -> &'a u8 { LL + fn one_input(x: &u8) -> &u8 { | -error: aborting due to 46 previous errors +error: aborting due to 47 previous errors diff --git a/src/tools/clippy/tests/ui/ptr_arg.stderr b/src/tools/clippy/tests/ui/ptr_arg.stderr index 1848ef80fc4..4246453e64c 100644 --- a/src/tools/clippy/tests/ui/ptr_arg.stderr +++ b/src/tools/clippy/tests/ui/ptr_arg.stderr @@ -1,3 +1,12 @@ +error: elided lifetime has a name + --> tests/ui/ptr_arg.rs:295:56 + | +LL | fn cow_good_ret_ty<'a>(input: &'a Cow<'a, str>) -> &str { + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + | + = note: `-D elided-named-lifetimes` implied by `-D warnings` + = help: to override `-D warnings` add `#[allow(elided_named_lifetimes)]` + error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do --> tests/ui/ptr_arg.rs:13:14 | @@ -212,5 +221,5 @@ error: using a reference to `Cow` is not recommended LL | fn cow_bad_ret_ty_2<'a, 'b>(input: &'a Cow<'a, str>) -> &'b str { | ^^^^^^^^^^^^^^^^ help: change this to: `&str` -error: aborting due to 24 previous errors +error: aborting due to 25 previous errors diff --git a/src/tools/rust-analyzer/crates/hir-def/src/attr.rs b/src/tools/rust-analyzer/crates/hir-def/src/attr.rs index 198dc93f6b1..c0547bc3c8d 100644 --- a/src/tools/rust-analyzer/crates/hir-def/src/attr.rs +++ b/src/tools/rust-analyzer/crates/hir-def/src/attr.rs @@ -117,7 +117,7 @@ impl Attrs { } impl Attrs { - pub fn by_key<'attrs>(&'attrs self, key: &'attrs Symbol) -> AttrQuery<'_> { + pub fn by_key<'attrs>(&'attrs self, key: &'attrs Symbol) -> AttrQuery<'attrs> { AttrQuery { attrs: self, key } } @@ -594,7 +594,7 @@ impl<'attr> AttrQuery<'attr> { /// #[doc(html_root_url = "url")] /// ^^^^^^^^^^^^^ key /// ``` - pub fn find_string_value_in_tt(self, key: &'attr Symbol) -> Option<&str> { + pub fn find_string_value_in_tt(self, key: &'attr Symbol) -> Option<&'attr str> { self.tt_values().find_map(|tt| { let name = tt.token_trees.iter() .skip_while(|tt| !matches!(tt, tt::TokenTree::Leaf(tt::Leaf::Ident(tt::Ident { sym, ..} )) if *sym == *key)) diff --git a/src/tools/rust-analyzer/crates/hir-def/src/body.rs b/src/tools/rust-analyzer/crates/hir-def/src/body.rs index f5fe8f87701..dde1f142ab0 100644 --- a/src/tools/rust-analyzer/crates/hir-def/src/body.rs +++ b/src/tools/rust-analyzer/crates/hir-def/src/body.rs @@ -197,7 +197,7 @@ impl Body { pub fn blocks<'a>( &'a self, db: &'a dyn DefDatabase, - ) -> impl Iterator<Item = (BlockId, Arc<DefMap>)> + '_ { + ) -> impl Iterator<Item = (BlockId, Arc<DefMap>)> + 'a { self.block_scopes.iter().map(move |&block| (block, db.block_def_map(block))) } diff --git a/tests/ui/async-await/issues/issue-63388-1.rs b/tests/ui/async-await/issues/issue-63388-1.rs index 32026a22a16..a6f499ba94e 100644 --- a/tests/ui/async-await/issues/issue-63388-1.rs +++ b/tests/ui/async-await/issues/issue-63388-1.rs @@ -9,7 +9,7 @@ trait Foo {} impl Xyz { async fn do_sth<'a>( &'a self, foo: &dyn Foo - ) -> &dyn Foo + ) -> &dyn Foo //~ WARNING elided lifetime has a name { //~^ ERROR explicit lifetime required in the type of `foo` [E0621] foo diff --git a/tests/ui/async-await/issues/issue-63388-1.stderr b/tests/ui/async-await/issues/issue-63388-1.stderr index f7f285ad0cc..ef74bfe3237 100644 --- a/tests/ui/async-await/issues/issue-63388-1.stderr +++ b/tests/ui/async-await/issues/issue-63388-1.stderr @@ -1,3 +1,14 @@ +warning: elided lifetime has a name + --> $DIR/issue-63388-1.rs:12:10 + | +LL | async fn do_sth<'a>( + | -- lifetime `'a` declared here +LL | &'a self, foo: &dyn Foo +LL | ) -> &dyn Foo + | ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0621]: explicit lifetime required in the type of `foo` --> $DIR/issue-63388-1.rs:13:5 | @@ -10,6 +21,6 @@ LL | | foo LL | | } | |_____^ lifetime `'a` required -error: aborting due to 1 previous error +error: aborting due to 1 previous error; 1 warning emitted For more information about this error, try `rustc --explain E0621`. diff --git a/tests/ui/const-generics/type-dependent/issue-71348.full.stderr b/tests/ui/const-generics/type-dependent/issue-71348.full.stderr new file mode 100644 index 00000000000..177ff20fbf9 --- /dev/null +++ b/tests/ui/const-generics/type-dependent/issue-71348.full.stderr @@ -0,0 +1,10 @@ +warning: elided lifetime has a name + --> $DIR/issue-71348.rs:18:68 + | +LL | fn ask<'a, const N: &'static str>(&'a self) -> &'a <Self as Get<N>>::Target + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +warning: 1 warning emitted + diff --git a/tests/ui/const-generics/type-dependent/issue-71348.min.stderr b/tests/ui/const-generics/type-dependent/issue-71348.min.stderr index 858900a500d..5aee282952a 100644 --- a/tests/ui/const-generics/type-dependent/issue-71348.min.stderr +++ b/tests/ui/const-generics/type-dependent/issue-71348.min.stderr @@ -1,3 +1,11 @@ +warning: elided lifetime has a name + --> $DIR/issue-71348.rs:18:68 + | +LL | fn ask<'a, const N: &'static str>(&'a self) -> &'a <Self as Get<N>>::Target + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error: `&'static str` is forbidden as the type of a const generic parameter --> $DIR/issue-71348.rs:10:24 | @@ -30,5 +38,5 @@ help: add `#![feature(unsized_const_params)]` to the crate attributes to enable LL + #![feature(unsized_const_params)] | -error: aborting due to 2 previous errors +error: aborting due to 2 previous errors; 1 warning emitted diff --git a/tests/ui/const-generics/type-dependent/issue-71348.rs b/tests/ui/const-generics/type-dependent/issue-71348.rs index 2ffbd015485..97e786405fe 100644 --- a/tests/ui/const-generics/type-dependent/issue-71348.rs +++ b/tests/ui/const-generics/type-dependent/issue-71348.rs @@ -17,6 +17,7 @@ trait Get<'a, const N: &'static str> { impl Foo { fn ask<'a, const N: &'static str>(&'a self) -> &'a <Self as Get<N>>::Target //[min]~^ ERROR `&'static str` is forbidden as the type of a const generic parameter + //~^^ WARNING elided lifetime has a name where Self: Get<'a, N>, { diff --git a/tests/ui/consts/min_const_fn/min_const_fn.rs b/tests/ui/consts/min_const_fn/min_const_fn.rs index 76245c08ffc..f7663f6044e 100644 --- a/tests/ui/consts/min_const_fn/min_const_fn.rs +++ b/tests/ui/consts/min_const_fn/min_const_fn.rs @@ -44,8 +44,8 @@ impl<T> Foo<T> { impl<'a, T> Foo<T> { const fn new_lt(t: T) -> Self { Foo(t) } const fn into_inner_lt(self) -> T { self.0 } //~ destructor of - const fn get_lt(&'a self) -> &T { &self.0 } - const fn get_mut_lt(&'a mut self) -> &mut T { &mut self.0 } + const fn get_lt(&'a self) -> &T { &self.0 } //~ WARNING elided lifetime has a name + const fn get_mut_lt(&'a mut self) -> &mut T { &mut self.0 } //~ WARNING elided lifetime has a name //~^ mutable references //~| mutable references //~| mutable references diff --git a/tests/ui/consts/min_const_fn/min_const_fn.stderr b/tests/ui/consts/min_const_fn/min_const_fn.stderr index daa0ab2614f..4b348a182b8 100644 --- a/tests/ui/consts/min_const_fn/min_const_fn.stderr +++ b/tests/ui/consts/min_const_fn/min_const_fn.stderr @@ -1,3 +1,23 @@ +warning: elided lifetime has a name + --> $DIR/min_const_fn.rs:47:34 + | +LL | impl<'a, T> Foo<T> { + | -- lifetime `'a` declared here +... +LL | const fn get_lt(&'a self) -> &T { &self.0 } + | ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +warning: elided lifetime has a name + --> $DIR/min_const_fn.rs:48:42 + | +LL | impl<'a, T> Foo<T> { + | -- lifetime `'a` declared here +... +LL | const fn get_mut_lt(&'a mut self) -> &mut T { &mut self.0 } + | ^ this elided lifetime gets resolved as `'a` + error[E0493]: destructor of `Foo<T>` cannot be evaluated at compile-time --> $DIR/min_const_fn.rs:37:25 | @@ -228,7 +248,7 @@ LL | const fn no_apit(_x: impl std::fmt::Debug) {} | | | the destructor for this type cannot be evaluated in constant functions -error: aborting due to 24 previous errors +error: aborting due to 24 previous errors; 2 warnings emitted Some errors have detailed explanations: E0493, E0658. For more information about an error, try `rustc --explain E0493`. diff --git a/tests/ui/generics/generic-no-mangle.fixed b/tests/ui/generics/generic-no-mangle.fixed index 69db712f9dc..2776848c45f 100644 --- a/tests/ui/generics/generic-no-mangle.fixed +++ b/tests/ui/generics/generic-no-mangle.fixed @@ -1,5 +1,5 @@ //@ run-rustfix -#![allow(dead_code)] +#![allow(dead_code, elided_named_lifetimes)] #![deny(no_mangle_generic_items)] pub fn foo<T>() {} //~ ERROR functions generic over types or consts must be mangled diff --git a/tests/ui/generics/generic-no-mangle.rs b/tests/ui/generics/generic-no-mangle.rs index 2288b5bbe70..5314005d31f 100644 --- a/tests/ui/generics/generic-no-mangle.rs +++ b/tests/ui/generics/generic-no-mangle.rs @@ -1,5 +1,5 @@ //@ run-rustfix -#![allow(dead_code)] +#![allow(dead_code, elided_named_lifetimes)] #![deny(no_mangle_generic_items)] #[no_mangle] diff --git a/tests/ui/impl-trait/impl-fn-hrtb-bounds.rs b/tests/ui/impl-trait/impl-fn-hrtb-bounds.rs index da7530b4e7a..a7f38b5c16a 100644 --- a/tests/ui/impl-trait/impl-fn-hrtb-bounds.rs +++ b/tests/ui/impl-trait/impl-fn-hrtb-bounds.rs @@ -13,6 +13,7 @@ fn b() -> impl for<'a> Fn(&'a u8) -> (impl Debug + 'a) { fn c() -> impl for<'a> Fn(&'a u8) -> (impl Debug + '_) { //~^ ERROR `impl Trait` cannot capture higher-ranked lifetime from outer `impl Trait` + //~| WARNING elided lifetime has a name |x| x } diff --git a/tests/ui/impl-trait/impl-fn-hrtb-bounds.stderr b/tests/ui/impl-trait/impl-fn-hrtb-bounds.stderr index 7d108b30b76..d0f8f7689d1 100644 --- a/tests/ui/impl-trait/impl-fn-hrtb-bounds.stderr +++ b/tests/ui/impl-trait/impl-fn-hrtb-bounds.stderr @@ -1,5 +1,5 @@ error[E0106]: missing lifetime specifier - --> $DIR/impl-fn-hrtb-bounds.rs:19:38 + --> $DIR/impl-fn-hrtb-bounds.rs:20:38 | LL | fn d() -> impl Fn() -> (impl Debug + '_) { | ^^ expected named lifetime parameter @@ -10,6 +10,14 @@ help: consider using the `'static` lifetime, but this is uncommon unless you're LL | fn d() -> impl Fn() -> (impl Debug + 'static) { | ~~~~~~~ +warning: elided lifetime has a name + --> $DIR/impl-fn-hrtb-bounds.rs:14:52 + | +LL | fn c() -> impl for<'a> Fn(&'a u8) -> (impl Debug + '_) { + | -- lifetime `'a` declared here ^^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from outer `impl Trait` --> $DIR/impl-fn-hrtb-bounds.rs:4:41 | @@ -46,7 +54,7 @@ note: lifetime declared here LL | fn c() -> impl for<'a> Fn(&'a u8) -> (impl Debug + '_) { | ^^ -error: aborting due to 4 previous errors +error: aborting due to 4 previous errors; 1 warning emitted Some errors have detailed explanations: E0106, E0657. For more information about an error, try `rustc --explain E0106`. diff --git a/tests/ui/impl-trait/impl-fn-predefined-lifetimes.rs b/tests/ui/impl-trait/impl-fn-predefined-lifetimes.rs index 8aba3de530b..2f17c0ff508 100644 --- a/tests/ui/impl-trait/impl-fn-predefined-lifetimes.rs +++ b/tests/ui/impl-trait/impl-fn-predefined-lifetimes.rs @@ -3,6 +3,7 @@ use std::fmt::Debug; fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) { //~^ ERROR cannot resolve opaque type + //~| WARNING elided lifetime has a name |x| x //~^ ERROR expected generic lifetime parameter, found `'_` } diff --git a/tests/ui/impl-trait/impl-fn-predefined-lifetimes.stderr b/tests/ui/impl-trait/impl-fn-predefined-lifetimes.stderr index c2386e8c88b..50a9f3ebeab 100644 --- a/tests/ui/impl-trait/impl-fn-predefined-lifetimes.stderr +++ b/tests/ui/impl-trait/impl-fn-predefined-lifetimes.stderr @@ -1,9 +1,17 @@ +warning: elided lifetime has a name + --> $DIR/impl-fn-predefined-lifetimes.rs:4:48 + | +LL | fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) { + | -- lifetime `'a` declared here ^^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0792]: expected generic lifetime parameter, found `'_` - --> $DIR/impl-fn-predefined-lifetimes.rs:6:9 + --> $DIR/impl-fn-predefined-lifetimes.rs:7:9 | LL | fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) { | -- this generic parameter must be used with a generic lifetime parameter -LL | +... LL | |x| x | ^ @@ -13,7 +21,7 @@ error[E0720]: cannot resolve opaque type LL | fn a<'a>() -> impl Fn(&'a u8) -> (impl Debug + '_) { | ^^^^^^^^^^^^^^^ cannot resolve opaque type -error: aborting due to 2 previous errors +error: aborting due to 2 previous errors; 1 warning emitted Some errors have detailed explanations: E0720, E0792. For more information about an error, try `rustc --explain E0720`. diff --git a/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.rs b/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.rs index 73c8a6c0aed..e48441f533d 100644 --- a/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.rs +++ b/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.rs @@ -1,6 +1,7 @@ //@ check-pass pub fn iter<'a>(v: Vec<(u32, &'a u32)>) -> impl DoubleEndedIterator<Item = (u32, &u32)> { + //~^ WARNING elided lifetime has a name v.into_iter() } diff --git a/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.stderr b/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.stderr new file mode 100644 index 00000000000..bff3ffd934a --- /dev/null +++ b/tests/ui/impl-trait/rpit-assoc-pair-with-lifetime.stderr @@ -0,0 +1,10 @@ +warning: elided lifetime has a name + --> $DIR/rpit-assoc-pair-with-lifetime.rs:3:82 + | +LL | pub fn iter<'a>(v: Vec<(u32, &'a u32)>) -> impl DoubleEndedIterator<Item = (u32, &u32)> { + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +warning: 1 warning emitted + diff --git a/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.rs b/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.rs index d0a8fe795ef..63a2c9be9eb 100644 --- a/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.rs +++ b/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.rs @@ -47,5 +47,6 @@ fn l<'a>(_: &'a str, _: &'a str) -> &str { "" } // This is ok because both `'a` are for the same parameter. fn m<'a>(_: &'a Foo<'a>) -> &str { "" } +//~^ WARNING elided lifetime has a name fn main() {} diff --git a/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.stderr b/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.stderr index 23ef36888f0..f835d2655bb 100644 --- a/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.stderr +++ b/tests/ui/lifetimes/lifetime-elision-return-type-requires-explicit-lifetime.stderr @@ -105,6 +105,16 @@ help: consider using the `'a` lifetime LL | fn l<'a>(_: &'a str, _: &'a str) -> &'a str { "" } | ++ -error: aborting due to 7 previous errors +warning: elided lifetime has a name + --> $DIR/lifetime-elision-return-type-requires-explicit-lifetime.rs:49:29 + | +LL | fn m<'a>(_: &'a Foo<'a>) -> &str { "" } + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +error: aborting due to 7 previous errors; 1 warning emitted For more information about this error, try `rustc --explain E0106`. diff --git a/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.rs b/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.rs index a1126d6bb15..598633d7576 100644 --- a/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.rs +++ b/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.rs @@ -4,6 +4,7 @@ struct Foo { impl Foo { fn foo<'a>(&'a self, x: &i32) -> &i32 { + //~^ WARNING elided lifetime has a name if true { &self.field } else { x } //~ ERROR explicit lifetime diff --git a/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.stderr b/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.stderr index 6dda9e61a79..2d5d4fb0e72 100644 --- a/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.stderr +++ b/tests/ui/lifetimes/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl-3.stderr @@ -1,12 +1,22 @@ +warning: elided lifetime has a name + --> $DIR/ex1-return-one-existing-name-if-else-using-impl-3.rs:6:36 + | +LL | fn foo<'a>(&'a self, x: &i32) -> &i32 { + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0621]: explicit lifetime required in the type of `x` - --> $DIR/ex1-return-one-existing-name-if-else-using-impl-3.rs:8:36 + --> $DIR/ex1-return-one-existing-name-if-else-using-impl-3.rs:9:36 | LL | fn foo<'a>(&'a self, x: &i32) -> &i32 { | ---- help: add explicit lifetime `'a` to the type of `x`: `&'a i32` -LL | +... LL | if true { &self.field } else { x } | ^ lifetime `'a` required -error: aborting due to 1 previous error +error: aborting due to 1 previous error; 1 warning emitted For more information about this error, try `rustc --explain E0621`. diff --git a/tests/ui/lint/elided-named-lifetimes/example-from-issue48686.rs b/tests/ui/lint/elided-named-lifetimes/example-from-issue48686.rs new file mode 100644 index 00000000000..eac7c32a9aa --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/example-from-issue48686.rs @@ -0,0 +1,12 @@ +#![deny(elided_named_lifetimes)] + +struct Foo; + +impl Foo { + pub fn get_mut(&'static self, x: &mut u8) -> &mut u8 { + //~^ ERROR elided lifetime has a name + unsafe { &mut *(x as *mut _) } + } +} + +fn main() {} diff --git a/tests/ui/lint/elided-named-lifetimes/example-from-issue48686.stderr b/tests/ui/lint/elided-named-lifetimes/example-from-issue48686.stderr new file mode 100644 index 00000000000..8c5426a60cb --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/example-from-issue48686.stderr @@ -0,0 +1,14 @@ +error: elided lifetime has a name + --> $DIR/example-from-issue48686.rs:6:50 + | +LL | pub fn get_mut(&'static self, x: &mut u8) -> &mut u8 { + | ^ this elided lifetime gets resolved as `'static` + | +note: the lint level is defined here + --> $DIR/example-from-issue48686.rs:1:9 + | +LL | #![deny(elided_named_lifetimes)] + | ^^^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 1 previous error + diff --git a/tests/ui/lint/elided-named-lifetimes/missing-lifetime-kind.rs b/tests/ui/lint/elided-named-lifetimes/missing-lifetime-kind.rs new file mode 100644 index 00000000000..2f9083ed65f --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/missing-lifetime-kind.rs @@ -0,0 +1,27 @@ +#![deny(elided_named_lifetimes)] + +fn ampersand<'a>(x: &'a u8) -> &u8 { + //~^ ERROR elided lifetime has a name + x +} + +struct Brackets<'a>(&'a u8); + +fn brackets<'a>(x: &'a u8) -> Brackets { + //~^ ERROR elided lifetime has a name + Brackets(x) +} + +struct Comma<'a, T>(&'a T); + +fn comma<'a>(x: &'a u8) -> Comma<u8> { + //~^ ERROR elided lifetime has a name + Comma(x) +} + +fn underscore<'a>(x: &'a u8) -> &'_ u8 { + //~^ ERROR elided lifetime has a name + x +} + +fn main() {} diff --git a/tests/ui/lint/elided-named-lifetimes/missing-lifetime-kind.stderr b/tests/ui/lint/elided-named-lifetimes/missing-lifetime-kind.stderr new file mode 100644 index 00000000000..249ae146b16 --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/missing-lifetime-kind.stderr @@ -0,0 +1,40 @@ +error: elided lifetime has a name + --> $DIR/missing-lifetime-kind.rs:3:32 + | +LL | fn ampersand<'a>(x: &'a u8) -> &u8 { + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + | +note: the lint level is defined here + --> $DIR/missing-lifetime-kind.rs:1:9 + | +LL | #![deny(elided_named_lifetimes)] + | ^^^^^^^^^^^^^^^^^^^^^^ + +error: elided lifetime has a name + --> $DIR/missing-lifetime-kind.rs:10:31 + | +LL | fn brackets<'a>(x: &'a u8) -> Brackets { + | -- ^^^^^^^^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + +error: elided lifetime has a name + --> $DIR/missing-lifetime-kind.rs:17:33 + | +LL | fn comma<'a>(x: &'a u8) -> Comma<u8> { + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + +error: elided lifetime has a name + --> $DIR/missing-lifetime-kind.rs:22:34 + | +LL | fn underscore<'a>(x: &'a u8) -> &'_ u8 { + | -- ^^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + +error: aborting due to 4 previous errors + diff --git a/tests/ui/lint/elided-named-lifetimes/not-tied-to-crate.rs b/tests/ui/lint/elided-named-lifetimes/not-tied-to-crate.rs new file mode 100644 index 00000000000..4f9218130fb --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/not-tied-to-crate.rs @@ -0,0 +1,17 @@ +#![allow(elided_named_lifetimes)] + +#[warn(elided_named_lifetimes)] +mod foo { + fn bar(x: &'static u8) -> &u8 { + //~^ WARNING elided lifetime has a name + x + } + + #[deny(elided_named_lifetimes)] + fn baz(x: &'static u8) -> &u8 { + //~^ ERROR elided lifetime has a name + x + } +} + +fn main() {} diff --git a/tests/ui/lint/elided-named-lifetimes/not-tied-to-crate.stderr b/tests/ui/lint/elided-named-lifetimes/not-tied-to-crate.stderr new file mode 100644 index 00000000000..c465aab1a03 --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/not-tied-to-crate.stderr @@ -0,0 +1,26 @@ +warning: elided lifetime has a name + --> $DIR/not-tied-to-crate.rs:5:31 + | +LL | fn bar(x: &'static u8) -> &u8 { + | ^ this elided lifetime gets resolved as `'static` + | +note: the lint level is defined here + --> $DIR/not-tied-to-crate.rs:3:8 + | +LL | #[warn(elided_named_lifetimes)] + | ^^^^^^^^^^^^^^^^^^^^^^ + +error: elided lifetime has a name + --> $DIR/not-tied-to-crate.rs:11:31 + | +LL | fn baz(x: &'static u8) -> &u8 { + | ^ this elided lifetime gets resolved as `'static` + | +note: the lint level is defined here + --> $DIR/not-tied-to-crate.rs:10:12 + | +LL | #[deny(elided_named_lifetimes)] + | ^^^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 1 previous error; 1 warning emitted + diff --git a/tests/ui/lint/elided-named-lifetimes/static.rs b/tests/ui/lint/elided-named-lifetimes/static.rs new file mode 100644 index 00000000000..dc8222c6e6e --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/static.rs @@ -0,0 +1,46 @@ +#![deny(elided_named_lifetimes)] + +use std::borrow::Cow; + +const A: &[u8] = &[]; +static B: &str = "hello"; + +trait Trait { + const C: &u8 = &0; +} + +impl Trait for () { + const C: &u8 = &1; +} + +fn ampersand(x: &'static u8) -> &u8 { + //~^ ERROR elided lifetime has a name + x +} + +struct Brackets<'a>(&'a u8); + +fn brackets(x: &'static u8) -> Brackets { + //~^ ERROR elided lifetime has a name + Brackets(x) +} + +struct Comma<'a, T>(&'a T); + +fn comma(x: &'static u8) -> Comma<u8> { + //~^ ERROR elided lifetime has a name + Comma(x) +} + +fn underscore(x: &'static u8) -> &'_ u8 { + //~^ ERROR elided lifetime has a name + x +} + +const NESTED: &Vec<&Box<Cow<str>>> = &vec![]; + +fn main() { + const HELLO: &str = "Hello"; + static WORLD: &str = "world"; + println!("{HELLO}, {WORLD}!") +} diff --git a/tests/ui/lint/elided-named-lifetimes/static.stderr b/tests/ui/lint/elided-named-lifetimes/static.stderr new file mode 100644 index 00000000000..d2e9776cb4f --- /dev/null +++ b/tests/ui/lint/elided-named-lifetimes/static.stderr @@ -0,0 +1,32 @@ +error: elided lifetime has a name + --> $DIR/static.rs:16:33 + | +LL | fn ampersand(x: &'static u8) -> &u8 { + | ^ this elided lifetime gets resolved as `'static` + | +note: the lint level is defined here + --> $DIR/static.rs:1:9 + | +LL | #![deny(elided_named_lifetimes)] + | ^^^^^^^^^^^^^^^^^^^^^^ + +error: elided lifetime has a name + --> $DIR/static.rs:23:32 + | +LL | fn brackets(x: &'static u8) -> Brackets { + | ^^^^^^^^ this elided lifetime gets resolved as `'static` + +error: elided lifetime has a name + --> $DIR/static.rs:30:34 + | +LL | fn comma(x: &'static u8) -> Comma<u8> { + | ^ this elided lifetime gets resolved as `'static` + +error: elided lifetime has a name + --> $DIR/static.rs:35:35 + | +LL | fn underscore(x: &'static u8) -> &'_ u8 { + | ^^ this elided lifetime gets resolved as `'static` + +error: aborting due to 4 previous errors + diff --git a/tests/ui/object-lifetime/object-lifetime-default-elision.rs b/tests/ui/object-lifetime/object-lifetime-default-elision.rs index f7c0261cfbb..ede6af51174 100644 --- a/tests/ui/object-lifetime/object-lifetime-default-elision.rs +++ b/tests/ui/object-lifetime/object-lifetime-default-elision.rs @@ -46,6 +46,8 @@ fn load1(ss: &dyn SomeTrait) -> &dyn SomeTrait { } fn load2<'a>(ss: &'a dyn SomeTrait) -> &dyn SomeTrait { + //~^ WARNING elided lifetime has a name + // Same as `load1` but with an explicit name thrown in for fun. ss diff --git a/tests/ui/object-lifetime/object-lifetime-default-elision.stderr b/tests/ui/object-lifetime/object-lifetime-default-elision.stderr index b5995687927..b44a184c684 100644 --- a/tests/ui/object-lifetime/object-lifetime-default-elision.stderr +++ b/tests/ui/object-lifetime/object-lifetime-default-elision.stderr @@ -1,5 +1,15 @@ +warning: elided lifetime has a name + --> $DIR/object-lifetime-default-elision.rs:48:40 + | +LL | fn load2<'a>(ss: &'a dyn SomeTrait) -> &dyn SomeTrait { + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error: lifetime may not live long enough - --> $DIR/object-lifetime-default-elision.rs:71:5 + --> $DIR/object-lifetime-default-elision.rs:73:5 | LL | fn load3<'a,'b>(ss: &'a dyn SomeTrait) -> &'b dyn SomeTrait { | -- -- lifetime `'b` defined here @@ -11,5 +21,5 @@ LL | ss | = help: consider adding the following bound: `'a: 'b` -error: aborting due to 1 previous error +error: aborting due to 1 previous error; 1 warning emitted diff --git a/tests/ui/self/elision/ignore-non-reference-lifetimes.rs b/tests/ui/self/elision/ignore-non-reference-lifetimes.rs index f7f61b8c810..cedc6f0f9bc 100644 --- a/tests/ui/self/elision/ignore-non-reference-lifetimes.rs +++ b/tests/ui/self/elision/ignore-non-reference-lifetimes.rs @@ -4,9 +4,11 @@ struct Foo<'a>(&'a str); impl<'b> Foo<'b> { fn a<'a>(self: Self, a: &'a str) -> &str { + //~^ WARNING elided lifetime has a name a } fn b<'a>(self: Foo<'b>, a: &'a str) -> &str { + //~^ WARNING elided lifetime has a name a } } diff --git a/tests/ui/self/elision/ignore-non-reference-lifetimes.stderr b/tests/ui/self/elision/ignore-non-reference-lifetimes.stderr new file mode 100644 index 00000000000..4465dbae529 --- /dev/null +++ b/tests/ui/self/elision/ignore-non-reference-lifetimes.stderr @@ -0,0 +1,16 @@ +warning: elided lifetime has a name + --> $DIR/ignore-non-reference-lifetimes.rs:6:41 + | +LL | fn a<'a>(self: Self, a: &'a str) -> &str { + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +warning: elided lifetime has a name + --> $DIR/ignore-non-reference-lifetimes.rs:10:44 + | +LL | fn b<'a>(self: Foo<'b>, a: &'a str) -> &str { + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + +warning: 2 warnings emitted + diff --git a/tests/ui/self/elision/lt-ref-self-async.fixed b/tests/ui/self/elision/lt-ref-self-async.fixed index aa1d62012da..914511641b8 100644 --- a/tests/ui/self/elision/lt-ref-self-async.fixed +++ b/tests/ui/self/elision/lt-ref-self-async.fixed @@ -1,6 +1,6 @@ //@ edition:2018 //@ run-rustfix -#![allow(non_snake_case, dead_code)] +#![allow(non_snake_case, dead_code, elided_named_lifetimes)] use std::pin::Pin; diff --git a/tests/ui/self/elision/lt-ref-self-async.rs b/tests/ui/self/elision/lt-ref-self-async.rs index 38de0fd39f0..0c11b271c35 100644 --- a/tests/ui/self/elision/lt-ref-self-async.rs +++ b/tests/ui/self/elision/lt-ref-self-async.rs @@ -1,6 +1,6 @@ //@ edition:2018 //@ run-rustfix -#![allow(non_snake_case, dead_code)] +#![allow(non_snake_case, dead_code, elided_named_lifetimes)] use std::pin::Pin; diff --git a/tests/ui/self/self_lifetime-async.rs b/tests/ui/self/self_lifetime-async.rs index 7d6eb3f5eaf..fd690207118 100644 --- a/tests/ui/self/self_lifetime-async.rs +++ b/tests/ui/self/self_lifetime-async.rs @@ -4,11 +4,13 @@ struct Foo<'a>(&'a ()); impl<'a> Foo<'a> { async fn foo<'b>(self: &'b Foo<'a>) -> &() { self.0 } + //~^ WARNING elided lifetime has a name } type Alias = Foo<'static>; impl Alias { async fn bar<'a>(self: &Alias, arg: &'a ()) -> &() { arg } + //~^ WARNING elided lifetime has a name } fn main() {} diff --git a/tests/ui/self/self_lifetime-async.stderr b/tests/ui/self/self_lifetime-async.stderr new file mode 100644 index 00000000000..32de3fd18c9 --- /dev/null +++ b/tests/ui/self/self_lifetime-async.stderr @@ -0,0 +1,18 @@ +warning: elided lifetime has a name + --> $DIR/self_lifetime-async.rs:6:44 + | +LL | async fn foo<'b>(self: &'b Foo<'a>) -> &() { self.0 } + | -- ^ this elided lifetime gets resolved as `'b` + | | + | lifetime `'b` declared here + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +warning: elided lifetime has a name + --> $DIR/self_lifetime-async.rs:12:52 + | +LL | async fn bar<'a>(self: &Alias, arg: &'a ()) -> &() { arg } + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + +warning: 2 warnings emitted + diff --git a/tests/ui/self/self_lifetime.rs b/tests/ui/self/self_lifetime.rs index 3f655b960b1..0607c3b9317 100644 --- a/tests/ui/self/self_lifetime.rs +++ b/tests/ui/self/self_lifetime.rs @@ -5,11 +5,13 @@ struct Foo<'a>(&'a ()); impl<'a> Foo<'a> { fn foo<'b>(self: &'b Foo<'a>) -> &() { self.0 } + //~^ WARNING elided lifetime has a name } type Alias = Foo<'static>; impl Alias { fn bar<'a>(self: &Alias, arg: &'a ()) -> &() { arg } + //~^ WARNING elided lifetime has a name } fn main() {} diff --git a/tests/ui/self/self_lifetime.stderr b/tests/ui/self/self_lifetime.stderr new file mode 100644 index 00000000000..cd8f4d8adf8 --- /dev/null +++ b/tests/ui/self/self_lifetime.stderr @@ -0,0 +1,18 @@ +warning: elided lifetime has a name + --> $DIR/self_lifetime.rs:7:38 + | +LL | fn foo<'b>(self: &'b Foo<'a>) -> &() { self.0 } + | -- ^ this elided lifetime gets resolved as `'b` + | | + | lifetime `'b` declared here + | + = note: `#[warn(elided_named_lifetimes)]` on by default + +warning: elided lifetime has a name + --> $DIR/self_lifetime.rs:13:46 + | +LL | fn bar<'a>(self: &Alias, arg: &'a ()) -> &() { arg } + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + +warning: 2 warnings emitted + diff --git a/tests/ui/suggestions/impl-trait-missing-lifetime-gated.rs b/tests/ui/suggestions/impl-trait-missing-lifetime-gated.rs index 735efe89cba..daec66709b6 100644 --- a/tests/ui/suggestions/impl-trait-missing-lifetime-gated.rs +++ b/tests/ui/suggestions/impl-trait-missing-lifetime-gated.rs @@ -64,6 +64,7 @@ mod in_path { // This must not err, as the `&` actually resolves to `'a`. fn resolved_anonymous<'a, T: 'a>(f: impl Fn(&'a str) -> &T) { + //~^ WARNING elided lifetime has a name f("f"); } diff --git a/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr b/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr index 61a2925f582..30f4509d49d 100644 --- a/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr +++ b/tests/ui/suggestions/impl-trait-missing-lifetime-gated.stderr @@ -124,6 +124,14 @@ LL - fn g(mut x: impl Foo<()>) -> Option<&()> { x.next() } LL + fn g(mut x: impl Foo<()>) -> Option<()> { x.next() } | +warning: elided lifetime has a name + --> $DIR/impl-trait-missing-lifetime-gated.rs:66:57 + | +LL | fn resolved_anonymous<'a, T: 'a>(f: impl Fn(&'a str) -> &T) { + | -- lifetime `'a` declared here ^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:6:35 | @@ -244,7 +252,7 @@ help: consider introducing a named lifetime parameter LL | fn g<'a>(mut x: impl Foo<'a, ()>) -> Option<&()> { x.next() } | ++++ +++ -error: aborting due to 16 previous errors +error: aborting due to 16 previous errors; 1 warning emitted Some errors have detailed explanations: E0106, E0658. For more information about an error, try `rustc --explain E0106`. diff --git a/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.rs b/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.rs index b641f5941dc..b61bea16e3b 100644 --- a/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.rs +++ b/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.rs @@ -100,6 +100,7 @@ where // This also works. The `'_` isn't necessary but it's where we arrive to following the suggestions: fn ok2<'a, G: 'a, T>(g: G, dest: &'a mut T) -> impl FnOnce() + '_ + 'a +//~^ WARNING elided lifetime has a name where G: Get<T>, { diff --git a/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index 88a18e9d06d..ea01dcd5020 100644 --- a/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/tests/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -6,6 +6,14 @@ LL | fn baz<G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ | | | help: consider introducing lifetime `'a` here: `'a,` +warning: elided lifetime has a name + --> $DIR/missing-lifetimes-in-signature.rs:102:64 + | +LL | fn ok2<'a, G: 'a, T>(g: G, dest: &'a mut T) -> impl FnOnce() + '_ + 'a + | -- lifetime `'a` declared here ^^ this elided lifetime gets resolved as `'a` + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0700]: hidden type for `impl FnOnce()` captures lifetime that does not appear in bounds --> $DIR/missing-lifetimes-in-signature.rs:19:5 | @@ -125,7 +133,7 @@ help: consider adding an explicit lifetime bound LL | G: Get<T> + 'a, | ++++ -error: aborting due to 8 previous errors +error: aborting due to 8 previous errors; 1 warning emitted Some errors have detailed explanations: E0261, E0309, E0311, E0621, E0700. For more information about an error, try `rustc --explain E0261`. diff --git a/tests/ui/type-alias-impl-trait/missing_lifetime_bound.rs b/tests/ui/type-alias-impl-trait/missing_lifetime_bound.rs index c584a58cb32..c178fcf5a91 100644 --- a/tests/ui/type-alias-impl-trait/missing_lifetime_bound.rs +++ b/tests/ui/type-alias-impl-trait/missing_lifetime_bound.rs @@ -2,7 +2,7 @@ type Opaque2<T> = impl Sized; type Opaque<'a, T> = Opaque2<T>; -fn defining<'a, T>(x: &'a i32) -> Opaque<T> { x } +fn defining<'a, T>(x: &'a i32) -> Opaque<T> { x } //~ WARNING elided lifetime has a name //~^ ERROR: hidden type for `Opaque2<T>` captures lifetime that does not appear in bounds fn main() {} diff --git a/tests/ui/type-alias-impl-trait/missing_lifetime_bound.stderr b/tests/ui/type-alias-impl-trait/missing_lifetime_bound.stderr index 03cc943d509..e2c21f1636b 100644 --- a/tests/ui/type-alias-impl-trait/missing_lifetime_bound.stderr +++ b/tests/ui/type-alias-impl-trait/missing_lifetime_bound.stderr @@ -1,3 +1,13 @@ +warning: elided lifetime has a name + --> $DIR/missing_lifetime_bound.rs:5:41 + | +LL | fn defining<'a, T>(x: &'a i32) -> Opaque<T> { x } + | -- ^ this elided lifetime gets resolved as `'a` + | | + | lifetime `'a` declared here + | + = note: `#[warn(elided_named_lifetimes)]` on by default + error[E0700]: hidden type for `Opaque2<T>` captures lifetime that does not appear in bounds --> $DIR/missing_lifetime_bound.rs:5:47 | @@ -9,6 +19,6 @@ LL | fn defining<'a, T>(x: &'a i32) -> Opaque<T> { x } | | | hidden type `&'a i32` captures the lifetime `'a` as defined here -error: aborting due to 1 previous error +error: aborting due to 1 previous error; 1 warning emitted For more information about this error, try `rustc --explain E0700`. |