diff options
18 files changed, 499 insertions, 106 deletions
diff --git a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs index 33b07aae325..c8c8b72b389 100644 --- a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs +++ b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs @@ -1,6 +1,5 @@ -use std::iter; - use either::Either; +use hir::PatField; use rustc_data_structures::captures::Captures; use rustc_data_structures::fx::FxIndexSet; use rustc_errors::{ @@ -28,6 +27,7 @@ use rustc_span::symbol::{kw, sym, Ident}; use rustc_span::{BytePos, Span, Symbol}; use rustc_trait_selection::infer::InferCtxtExt; use rustc_trait_selection::traits::ObligationCtxt; +use std::iter; use crate::borrow_set::TwoPhaseActivation; use crate::borrowck_errors; @@ -992,6 +992,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> { issued_borrow.borrowed_place, &issued_spans, ); + self.explain_iterator_advancement_in_for_loop_if_applicable( + &mut err, + span, + &issued_spans, + ); err } @@ -1279,6 +1284,73 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> { } } + /// Suggest using `while let` for call `next` on an iterator in a for loop. + /// + /// For example: + /// ```ignore (illustrative) + /// + /// for x in iter { + /// ... + /// iter.next() + /// } + /// ``` + pub(crate) fn explain_iterator_advancement_in_for_loop_if_applicable( + &self, + err: &mut Diagnostic, + span: Span, + issued_spans: &UseSpans<'tcx>, + ) { + let issue_span = issued_spans.args_or_use(); + let tcx = self.infcx.tcx; + let hir = tcx.hir(); + + let Some(body_id) = hir.get(self.mir_hir_id()).body_id() else { return }; + let typeck_results = tcx.typeck(self.mir_def_id()); + + struct ExprFinder<'hir> { + issue_span: Span, + expr_span: Span, + body_expr: Option<&'hir hir::Expr<'hir>>, + loop_bind: Option<Symbol>, + } + impl<'hir> Visitor<'hir> for ExprFinder<'hir> { + fn visit_expr(&mut self, ex: &'hir hir::Expr<'hir>) { + if let hir::ExprKind::Loop(hir::Block{ stmts: [stmt, ..], ..}, _, hir::LoopSource::ForLoop, _) = ex.kind && + let hir::StmtKind::Expr(hir::Expr{ kind: hir::ExprKind::Match(call, [_, bind, ..], _), ..}) = stmt.kind && + let hir::ExprKind::Call(path, _args) = call.kind && + let hir::ExprKind::Path(hir::QPath::LangItem(LangItem::IteratorNext, _, _, )) = path.kind && + let hir::PatKind::Struct(path, [field, ..], _) = bind.pat.kind && + let hir::QPath::LangItem(LangItem::OptionSome, _, _) = path && + let PatField { pat: hir::Pat{ kind: hir::PatKind::Binding(_, _, ident, ..), .. }, ..} = field && + self.issue_span.source_equal(call.span) { + self.loop_bind = Some(ident.name); + } + + if let hir::ExprKind::MethodCall(body_call, _recv, ..) = ex.kind && + body_call.ident.name == sym::next && ex.span.source_equal(self.expr_span) { + self.body_expr = Some(ex); + } + + hir::intravisit::walk_expr(self, ex); + } + } + let mut finder = + ExprFinder { expr_span: span, issue_span, loop_bind: None, body_expr: None }; + finder.visit_expr(hir.body(body_id).value); + + if let Some(loop_bind) = finder.loop_bind && + let Some(body_expr) = finder.body_expr && + let Some(def_id) = typeck_results.type_dependent_def_id(body_expr.hir_id) && + let Some(trait_did) = tcx.trait_of_item(def_id) && + tcx.is_diagnostic_item(sym::Iterator, trait_did) { + err.note(format!( + "a for loop advances the iterator for you, the result is stored in `{}`.", + loop_bind + )); + err.help("if you want to call `next` on a iterator within the loop, consider using `while let`."); + } + } + /// Suggest using closure argument instead of capture. /// /// For example: diff --git a/compiler/rustc_borrowck/src/diagnostics/mod.rs b/compiler/rustc_borrowck/src/diagnostics/mod.rs index 2f8c970f806..42e50fd0fad 100644 --- a/compiler/rustc_borrowck/src/diagnostics/mod.rs +++ b/compiler/rustc_borrowck/src/diagnostics/mod.rs @@ -1146,6 +1146,12 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> { // Avoid pointing to the same function in multiple different // error messages. if span != DUMMY_SP && self.fn_self_span_reported.insert(self_arg.span) { + self.explain_iterator_advancement_in_for_loop_if_applicable( + err, + span, + &move_spans, + ); + let func = tcx.def_path_str(method_did); err.subdiagnostic(CaptureReasonNote::FuncTakeSelf { func, diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs index 3048c175e1e..76edeccaf29 100644 --- a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs +++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs @@ -19,7 +19,7 @@ use rustc_middle::ty::{ self, InternalSubsts, Ty, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt, }; use rustc_middle::ty::{GenericParamDefKind, ToPredicate, TyCtxt}; -use rustc_span::Span; +use rustc_span::{Span, DUMMY_SP}; use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt; use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _; use rustc_trait_selection::traits::{ @@ -651,11 +651,7 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>( let impl_sig = ocx.normalize( &norm_cause, param_env, - infcx.instantiate_binder_with_fresh_vars( - return_span, - infer::HigherRankedType, - tcx.fn_sig(impl_m.def_id).subst_identity(), - ), + tcx.liberate_late_bound_regions(impl_m.def_id, tcx.fn_sig(impl_m.def_id).subst_identity()), ); impl_sig.error_reported()?; let impl_return_ty = impl_sig.output(); @@ -665,9 +661,10 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>( // them with inference variables. // We will use these inference variables to collect the hidden types of RPITITs. let mut collector = ImplTraitInTraitCollector::new(&ocx, return_span, param_env, impl_m_def_id); - let unnormalized_trait_sig = tcx - .liberate_late_bound_regions( - impl_m.def_id, + let unnormalized_trait_sig = infcx + .instantiate_binder_with_fresh_vars( + return_span, + infer::HigherRankedType, tcx.fn_sig(trait_m.def_id).subst(tcx, trait_to_placeholder_substs), ) .fold_with(&mut collector); @@ -760,15 +757,17 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>( let mut collected_tys = FxHashMap::default(); for (def_id, (ty, substs)) in collected_types { - match infcx.fully_resolve(ty) { - Ok(ty) => { + match infcx.fully_resolve((ty, substs)) { + Ok((ty, substs)) => { // `ty` contains free regions that we created earlier while liberating the // trait fn signature. However, projection normalization expects `ty` to // contains `def_id`'s early-bound regions. let id_substs = InternalSubsts::identity_for_item(tcx, def_id); debug!(?id_substs, ?substs); - let map: FxHashMap<ty::GenericArg<'tcx>, ty::GenericArg<'tcx>> = - std::iter::zip(substs, id_substs).collect(); + let map: FxHashMap<_, _> = std::iter::zip(substs, id_substs) + .skip(tcx.generics_of(trait_m.def_id).count()) + .filter_map(|(a, b)| Some((a.as_region()?, b.as_region()?))) + .collect(); debug!(?map); // NOTE(compiler-errors): RPITITs, like all other RPITs, have early-bound @@ -793,25 +792,19 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>( // same generics. let num_trait_substs = trait_to_impl_substs.len(); let num_impl_substs = tcx.generics_of(impl_m.container_id(tcx)).params.len(); - let ty = tcx.fold_regions(ty, |region, _| { - match region.kind() { - // Remap all free regions, which correspond to late-bound regions in the function. - ty::ReFree(_) => {} - // Remap early-bound regions as long as they don't come from the `impl` itself. - ty::ReEarlyBound(ebr) if tcx.parent(ebr.def_id) != impl_m.container_id(tcx) => {} - _ => return region, - } - let Some(ty::ReEarlyBound(e)) = map.get(®ion.into()).map(|r| r.expect_region().kind()) - else { - return ty::Region::new_error_with_message(tcx, return_span, "expected ReFree to map to ReEarlyBound") - }; - ty::Region::new_early_bound(tcx, ty::EarlyBoundRegion { - def_id: e.def_id, - name: e.name, - index: (e.index as usize - num_trait_substs + num_impl_substs) as u32, - }) - }); - debug!(%ty); + let ty = match ty.try_fold_with(&mut RemapHiddenTyRegions { + tcx, + map, + num_trait_substs, + num_impl_substs, + def_id, + impl_def_id: impl_m.container_id(tcx), + ty, + return_span, + }) { + Ok(ty) => ty, + Err(guar) => tcx.ty_error(guar), + }; collected_tys.insert(def_id, ty::EarlyBinder::bind(ty)); } Err(err) => { @@ -895,6 +888,97 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ImplTraitInTraitCollector<'_, 'tcx> { } } +struct RemapHiddenTyRegions<'tcx> { + tcx: TyCtxt<'tcx>, + map: FxHashMap<ty::Region<'tcx>, ty::Region<'tcx>>, + num_trait_substs: usize, + num_impl_substs: usize, + def_id: DefId, + impl_def_id: DefId, + ty: Ty<'tcx>, + return_span: Span, +} + +impl<'tcx> ty::FallibleTypeFolder<TyCtxt<'tcx>> for RemapHiddenTyRegions<'tcx> { + type Error = ErrorGuaranteed; + + fn interner(&self) -> TyCtxt<'tcx> { + self.tcx + } + + fn try_fold_ty(&mut self, t: Ty<'tcx>) -> Result<Ty<'tcx>, Self::Error> { + if let ty::Alias(ty::Opaque, ty::AliasTy { substs, def_id, .. }) = *t.kind() { + let mut mapped_substs = Vec::with_capacity(substs.len()); + for (arg, v) in std::iter::zip(substs, self.tcx.variances_of(def_id)) { + mapped_substs.push(match (arg.unpack(), v) { + // Skip uncaptured opaque substs + (ty::GenericArgKind::Lifetime(_), ty::Bivariant) => arg, + _ => arg.try_fold_with(self)?, + }); + } + Ok(self.tcx.mk_opaque(def_id, self.tcx.mk_substs(&mapped_substs))) + } else { + t.try_super_fold_with(self) + } + } + + fn try_fold_region( + &mut self, + region: ty::Region<'tcx>, + ) -> Result<ty::Region<'tcx>, Self::Error> { + match region.kind() { + // Remap all free regions, which correspond to late-bound regions in the function. + ty::ReFree(_) => {} + // Remap early-bound regions as long as they don't come from the `impl` itself, + // in which case we don't really need to renumber them. + ty::ReEarlyBound(ebr) if self.tcx.parent(ebr.def_id) != self.impl_def_id => {} + _ => return Ok(region), + } + + let e = if let Some(region) = self.map.get(®ion) { + if let ty::ReEarlyBound(e) = region.kind() { e } else { bug!() } + } else { + let guar = match region.kind() { + ty::ReEarlyBound(ty::EarlyBoundRegion { def_id, .. }) + | ty::ReFree(ty::FreeRegion { + bound_region: ty::BoundRegionKind::BrNamed(def_id, _), + .. + }) => { + let return_span = if let ty::Alias(ty::Opaque, opaque_ty) = self.ty.kind() { + self.tcx.def_span(opaque_ty.def_id) + } else { + self.return_span + }; + self.tcx + .sess + .struct_span_err( + return_span, + "return type captures more lifetimes than trait definition", + ) + .span_label(self.tcx.def_span(def_id), "this lifetime was captured") + .span_note( + self.tcx.def_span(self.def_id), + "hidden type must only reference lifetimes captured by this impl trait", + ) + .note(format!("hidden type inferred to be `{}`", self.ty)) + .emit() + } + _ => self.tcx.sess.delay_span_bug(DUMMY_SP, "should've been able to remap region"), + }; + return Err(guar); + }; + + Ok(ty::Region::new_early_bound( + self.tcx, + ty::EarlyBoundRegion { + def_id: e.def_id, + name: e.name, + index: (e.index as usize - self.num_trait_substs + self.num_impl_substs) as u32, + }, + )) + } +} + fn report_trait_method_mismatch<'tcx>( infcx: &InferCtxt<'tcx>, mut cause: ObligationCause<'tcx>, diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs index c3e8d45d201..055006373ef 100644 --- a/compiler/rustc_privacy/src/lib.rs +++ b/compiler/rustc_privacy/src/lib.rs @@ -2135,16 +2135,18 @@ impl<'tcx> PrivateItemsInPublicInterfacesChecker<'tcx, '_> { // lints shouldn't be emmited even if `from` effective visibility // is larger than `Priv` nominal visibility and if `Priv` can leak // in some scenarios due to type inference. - let impl_ev = Some(EffectiveVisibility::of_impl::<false>( + let impl_ev = EffectiveVisibility::of_impl::<false>( item.owner_id.def_id, tcx, self.effective_visibilities, - )); + ); // check that private components do not appear in the generics or predicates of inherent impls // this check is intentionally NOT performed for impls of traits, per #90586 if impl_.of_trait.is_none() { - self.check(item.owner_id.def_id, impl_vis, impl_ev).generics().predicates(); + self.check(item.owner_id.def_id, impl_vis, Some(impl_ev)) + .generics() + .predicates(); } for impl_item_ref in impl_.items { let impl_item_vis = if impl_.of_trait.is_none() { @@ -2159,8 +2161,9 @@ impl<'tcx> PrivateItemsInPublicInterfacesChecker<'tcx, '_> { let impl_item_ev = if impl_.of_trait.is_none() { self.get(impl_item_ref.id.owner_id.def_id) + .map(|ev| ev.min(impl_ev, self.tcx)) } else { - impl_ev + Some(impl_ev) }; self.check_assoc_item( diff --git a/compiler/rustc_resolve/src/ident.rs b/compiler/rustc_resolve/src/ident.rs index 8e921f1ecb1..36f01676e7e 100644 --- a/compiler/rustc_resolve/src/ident.rs +++ b/compiler/rustc_resolve/src/ident.rs @@ -370,7 +370,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> { /// expansion and import resolution (perhaps they can be merged in the future). /// The function is used for resolving initial segments of macro paths (e.g., `foo` in /// `foo::bar!();` or `foo!();`) and also for import paths on 2018 edition. - #[instrument(level = "debug", skip(self, scope_set))] + #[instrument(level = "debug", skip(self))] pub(crate) fn early_resolve_ident_in_lexical_scope( &mut self, orig_ident: Ident, diff --git a/compiler/rustc_resolve/src/imports.rs b/compiler/rustc_resolve/src/imports.rs index 8bd08921fe6..074f761c53b 100644 --- a/compiler/rustc_resolve/src/imports.rs +++ b/compiler/rustc_resolve/src/imports.rs @@ -894,8 +894,9 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> { } return None; } - PathResult::NonModule(_) => { - if no_ambiguity { + PathResult::NonModule(partial_res) => { + if no_ambiguity && partial_res.full_res() != Some(Res::Err) { + // Check if there are no ambiguities and the result is not dummy. assert!(import.imported_module.get().is_none()); } // The error was already reported earlier. diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs index ff698452ad5..cc4cb9fa30c 100644 --- a/compiler/rustc_resolve/src/lib.rs +++ b/compiler/rustc_resolve/src/lib.rs @@ -128,7 +128,7 @@ enum Scope<'a> { /// with different restrictions when looking up the resolution. /// This enum is currently used only for early resolution (imports and macros), /// but not for late resolution yet. -#[derive(Clone, Copy)] +#[derive(Clone, Copy, Debug)] enum ScopeSet<'a> { /// All scopes with the given namespace. All(Namespace), diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs index a34a594f137..4522819f996 100644 --- a/src/bootstrap/dist.rs +++ b/src/bootstrap/dist.rs @@ -1601,9 +1601,7 @@ impl Step for Extended { prepare("cargo"); prepare("rust-analysis"); prepare("rust-std"); - prepare("clippy"); - prepare("rust-analyzer"); - for tool in &["rust-docs", "rust-demangler", "miri"] { + for tool in &["clippy", "rust-analyzer", "rust-docs", "rust-demangler", "miri"] { if built_tools.contains(tool) { prepare(tool); } @@ -1689,40 +1687,44 @@ impl Step for Extended { .arg("-out") .arg(exe.join("StdGroup.wxs")), ); - builder.run( - Command::new(&heat) - .current_dir(&exe) - .arg("dir") - .arg("rust-analyzer") - .args(&heat_flags) - .arg("-cg") - .arg("RustAnalyzerGroup") - .arg("-dr") - .arg("RustAnalyzer") - .arg("-var") - .arg("var.RustAnalyzerDir") - .arg("-out") - .arg(exe.join("RustAnalyzerGroup.wxs")) - .arg("-t") - .arg(etc.join("msi/remove-duplicates.xsl")), - ); - builder.run( - Command::new(&heat) - .current_dir(&exe) - .arg("dir") - .arg("clippy") - .args(&heat_flags) - .arg("-cg") - .arg("ClippyGroup") - .arg("-dr") - .arg("Clippy") - .arg("-var") - .arg("var.ClippyDir") - .arg("-out") - .arg(exe.join("ClippyGroup.wxs")) - .arg("-t") - .arg(etc.join("msi/remove-duplicates.xsl")), - ); + if built_tools.contains("rust-analyzer") { + builder.run( + Command::new(&heat) + .current_dir(&exe) + .arg("dir") + .arg("rust-analyzer") + .args(&heat_flags) + .arg("-cg") + .arg("RustAnalyzerGroup") + .arg("-dr") + .arg("RustAnalyzer") + .arg("-var") + .arg("var.RustAnalyzerDir") + .arg("-out") + .arg(exe.join("RustAnalyzerGroup.wxs")) + .arg("-t") + .arg(etc.join("msi/remove-duplicates.xsl")), + ); + } + if built_tools.contains("clippy") { + builder.run( + Command::new(&heat) + .current_dir(&exe) + .arg("dir") + .arg("clippy") + .args(&heat_flags) + .arg("-cg") + .arg("ClippyGroup") + .arg("-dr") + .arg("Clippy") + .arg("-var") + .arg("var.ClippyDir") + .arg("-out") + .arg(exe.join("ClippyGroup.wxs")) + .arg("-t") + .arg(etc.join("msi/remove-duplicates.xsl")), + ); + } if built_tools.contains("rust-demangler") { builder.run( Command::new(&heat) @@ -1806,7 +1808,6 @@ impl Step for Extended { .arg("-dCargoDir=cargo") .arg("-dStdDir=rust-std") .arg("-dAnalysisDir=rust-analysis") - .arg("-dClippyDir=clippy") .arg("-arch") .arg(&arch) .arg("-out") @@ -1814,6 +1815,9 @@ impl Step for Extended { .arg(&input); add_env(builder, &mut cmd, target); + if built_tools.contains("clippy") { + cmd.arg("-dClippyDir=clippy"); + } if built_tools.contains("rust-docs") { cmd.arg("-dDocsDir=rust-docs"); } @@ -1840,7 +1844,9 @@ impl Step for Extended { } candle("CargoGroup.wxs".as_ref()); candle("StdGroup.wxs".as_ref()); - candle("ClippyGroup.wxs".as_ref()); + if built_tools.contains("clippy") { + candle("ClippyGroup.wxs".as_ref()); + } if built_tools.contains("miri") { candle("MiriGroup.wxs".as_ref()); } @@ -1877,9 +1883,11 @@ impl Step for Extended { .arg("CargoGroup.wixobj") .arg("StdGroup.wixobj") .arg("AnalysisGroup.wixobj") - .arg("ClippyGroup.wixobj") .current_dir(&exe); + if built_tools.contains("clippy") { + cmd.arg("ClippyGroup.wixobj"); + } if built_tools.contains("miri") { cmd.arg("MiriGroup.wixobj"); } diff --git a/tests/ui/impl-trait/in-trait/method-signature-matches.lt.stderr b/tests/ui/impl-trait/in-trait/method-signature-matches.lt.stderr index f604ada6ac7..239c4b35c72 100644 --- a/tests/ui/impl-trait/in-trait/method-signature-matches.lt.stderr +++ b/tests/ui/impl-trait/in-trait/method-signature-matches.lt.stderr @@ -5,7 +5,7 @@ LL | fn early<'late, T>(_: &'late ()) {} | - ^^^^^^^^^ | | | | | expected type parameter `T`, found `()` - | | help: change the parameter type to match the trait: `&'early T` + | | help: change the parameter type to match the trait: `&T` | this type parameter | note: type in trait @@ -13,8 +13,8 @@ note: type in trait | LL | fn early<'early, T>(x: &'early T) -> impl Sized; | ^^^^^^^^^ - = note: expected signature `fn(&'early T)` - found signature `fn(&())` + = note: expected signature `fn(&T)` + found signature `fn(&'late ())` error: aborting due to previous error diff --git a/tests/ui/impl-trait/in-trait/signature-mismatch.current.stderr b/tests/ui/impl-trait/in-trait/signature-mismatch.current.stderr index eba270af7f0..8c9dd403174 100644 --- a/tests/ui/impl-trait/in-trait/signature-mismatch.current.stderr +++ b/tests/ui/impl-trait/in-trait/signature-mismatch.current.stderr @@ -1,16 +1,61 @@ -error: `impl` item signature doesn't match `trait` item signature - --> $DIR/signature-mismatch.rs:17:5 +error: return type captures more lifetimes than trait definition + --> $DIR/signature-mismatch.rs:36:47 + | +LL | fn async_fn<'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { + | -- this lifetime was captured ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: hidden type must only reference lifetimes captured by this impl trait + --> $DIR/signature-mismatch.rs:17:40 | LL | fn async_fn(&self, buff: &[u8]) -> impl Future<Output = Vec<u8>>; - | ----------------------------------------------------------------- expected `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '3` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: hidden type inferred to be `impl Future<Output = Vec<u8>> + 'a` + +error: return type captures more lifetimes than trait definition + --> $DIR/signature-mismatch.rs:41:57 + | +LL | fn async_fn_early<'a: 'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { + | -- this lifetime was captured ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: hidden type must only reference lifetimes captured by this impl trait + --> $DIR/signature-mismatch.rs:18:57 + | +LL | fn async_fn_early<'a: 'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>>; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: hidden type inferred to be `impl Future<Output = Vec<u8>> + 'a` + +error: return type captures more lifetimes than trait definition + --> $DIR/signature-mismatch.rs:49:10 + | +LL | fn async_fn_multiple<'a, 'b>( + | -- this lifetime was captured ... -LL | fn async_fn<'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '2` +LL | ) -> impl Future<Output = Vec<u8>> + Captures2<'a, 'b> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: hidden type must only reference lifetimes captured by this impl trait + --> $DIR/signature-mismatch.rs:20:12 + | +LL | -> impl Future<Output = Vec<u8>> + Captures<'a>; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: hidden type inferred to be `impl Future<Output = Vec<u8>> + Captures2<'a, 'b>` + +error[E0309]: the parameter type `T` may not live long enough + --> $DIR/signature-mismatch.rs:58:10 + | +LL | ) -> impl Future<Output = Vec<u8>> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `impl Future<Output = Vec<u8>>` will meet its required lifetime bounds... + | +note: ...that is required by this bound + --> $DIR/signature-mismatch.rs:25:42 + | +LL | ) -> impl Future<Output = Vec<u8>> + 'a; + | ^^ +help: consider adding an explicit lifetime bound... | - = note: expected signature `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '3` - found signature `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '2` - = help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` - = help: verify the lifetime relationships in the `trait` and `impl` between the `self` argument, the other inputs and its output +LL | fn async_fn_reduce_outlive<'a, 'b, T: 'a>( + | ++++ -error: aborting due to previous error +error: aborting due to 4 previous errors +For more information about this error, try `rustc --explain E0309`. diff --git a/tests/ui/impl-trait/in-trait/signature-mismatch.next.stderr b/tests/ui/impl-trait/in-trait/signature-mismatch.next.stderr index eba270af7f0..8c9dd403174 100644 --- a/tests/ui/impl-trait/in-trait/signature-mismatch.next.stderr +++ b/tests/ui/impl-trait/in-trait/signature-mismatch.next.stderr @@ -1,16 +1,61 @@ -error: `impl` item signature doesn't match `trait` item signature - --> $DIR/signature-mismatch.rs:17:5 +error: return type captures more lifetimes than trait definition + --> $DIR/signature-mismatch.rs:36:47 + | +LL | fn async_fn<'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { + | -- this lifetime was captured ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: hidden type must only reference lifetimes captured by this impl trait + --> $DIR/signature-mismatch.rs:17:40 | LL | fn async_fn(&self, buff: &[u8]) -> impl Future<Output = Vec<u8>>; - | ----------------------------------------------------------------- expected `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '3` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: hidden type inferred to be `impl Future<Output = Vec<u8>> + 'a` + +error: return type captures more lifetimes than trait definition + --> $DIR/signature-mismatch.rs:41:57 + | +LL | fn async_fn_early<'a: 'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { + | -- this lifetime was captured ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: hidden type must only reference lifetimes captured by this impl trait + --> $DIR/signature-mismatch.rs:18:57 + | +LL | fn async_fn_early<'a: 'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>>; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: hidden type inferred to be `impl Future<Output = Vec<u8>> + 'a` + +error: return type captures more lifetimes than trait definition + --> $DIR/signature-mismatch.rs:49:10 + | +LL | fn async_fn_multiple<'a, 'b>( + | -- this lifetime was captured ... -LL | fn async_fn<'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '2` +LL | ) -> impl Future<Output = Vec<u8>> + Captures2<'a, 'b> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: hidden type must only reference lifetimes captured by this impl trait + --> $DIR/signature-mismatch.rs:20:12 + | +LL | -> impl Future<Output = Vec<u8>> + Captures<'a>; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: hidden type inferred to be `impl Future<Output = Vec<u8>> + Captures2<'a, 'b>` + +error[E0309]: the parameter type `T` may not live long enough + --> $DIR/signature-mismatch.rs:58:10 + | +LL | ) -> impl Future<Output = Vec<u8>> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `impl Future<Output = Vec<u8>>` will meet its required lifetime bounds... + | +note: ...that is required by this bound + --> $DIR/signature-mismatch.rs:25:42 + | +LL | ) -> impl Future<Output = Vec<u8>> + 'a; + | ^^ +help: consider adding an explicit lifetime bound... | - = note: expected signature `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '3` - found signature `fn(&'1 Struct, &'2 [u8]) -> impl Future<Output = Vec<u8>> + '2` - = help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait` - = help: verify the lifetime relationships in the `trait` and `impl` between the `self` argument, the other inputs and its output +LL | fn async_fn_reduce_outlive<'a, 'b, T: 'a>( + | ++++ -error: aborting due to previous error +error: aborting due to 4 previous errors +For more information about this error, try `rustc --explain E0309`. diff --git a/tests/ui/impl-trait/in-trait/signature-mismatch.rs b/tests/ui/impl-trait/in-trait/signature-mismatch.rs index 38c902a97a9..23dd71acecb 100644 --- a/tests/ui/impl-trait/in-trait/signature-mismatch.rs +++ b/tests/ui/impl-trait/in-trait/signature-mismatch.rs @@ -7,17 +7,70 @@ use std::future::Future; +trait Captures<'a> {} +impl<T> Captures<'_> for T {} + +trait Captures2<'a, 'b> {} +impl<T> Captures2<'_, '_> for T {} + pub trait AsyncTrait { fn async_fn(&self, buff: &[u8]) -> impl Future<Output = Vec<u8>>; + fn async_fn_early<'a: 'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>>; + fn async_fn_multiple<'a>(&'a self, buff: &[u8]) + -> impl Future<Output = Vec<u8>> + Captures<'a>; + fn async_fn_reduce_outlive<'a, T>( + &'a self, + buff: &[u8], + t: T, + ) -> impl Future<Output = Vec<u8>> + 'a; + fn async_fn_reduce<'a, T>( + &'a self, + buff: &[u8], + t: T, + ) -> impl Future<Output = Vec<u8>> + Captures<'a>; } pub struct Struct; impl AsyncTrait for Struct { fn async_fn<'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { - //~^ ERROR `impl` item signature doesn't match `trait` item signature + //~^ ERROR return type captures more lifetimes than trait definition + async move { buff.to_vec() } + } + + fn async_fn_early<'a: 'a>(&self, buff: &'a [u8]) -> impl Future<Output = Vec<u8>> + 'a { + //~^ ERROR return type captures more lifetimes than trait definition + async move { buff.to_vec() } + } + + fn async_fn_multiple<'a, 'b>( + &'a self, + buff: &'b [u8], + ) -> impl Future<Output = Vec<u8>> + Captures2<'a, 'b> { + //~^ ERROR return type captures more lifetimes than trait definition async move { buff.to_vec() } } + + fn async_fn_reduce_outlive<'a, 'b, T>( + &'a self, + buff: &'b [u8], + t: T, + ) -> impl Future<Output = Vec<u8>> { + //~^ ERROR the parameter type `T` may not live long enough + async move { + let _t = t; + vec![] + } + } + + // OK: We remove the `Captures<'a>`, providing a guarantee that we don't capture `'a`, + // but we still fulfill the `Captures<'a>` trait bound. + fn async_fn_reduce<'a, 'b, T>(&'a self, buff: &'b [u8], t: T) -> impl Future<Output = Vec<u8>> { + async move { + let _t = t; + vec![] + } + } } fn main() {} diff --git a/tests/ui/imports/auxiliary/issue-85992-extern-1.rs b/tests/ui/imports/auxiliary/issue-85992-extern-1.rs new file mode 100644 index 00000000000..a2d0e206065 --- /dev/null +++ b/tests/ui/imports/auxiliary/issue-85992-extern-1.rs @@ -0,0 +1,6 @@ +#[macro_export] +macro_rules! m { + () => { + use issue_85992_extern_2::Outcome; + } +} diff --git a/tests/ui/imports/auxiliary/issue-85992-extern-2.rs b/tests/ui/imports/auxiliary/issue-85992-extern-2.rs new file mode 100644 index 00000000000..e9b6a44cfe2 --- /dev/null +++ b/tests/ui/imports/auxiliary/issue-85992-extern-2.rs @@ -0,0 +1 @@ +// nothing diff --git a/tests/ui/imports/issue-85992.rs b/tests/ui/imports/issue-85992.rs new file mode 100644 index 00000000000..d5524109144 --- /dev/null +++ b/tests/ui/imports/issue-85992.rs @@ -0,0 +1,11 @@ +// edition: 2021 +// compile-flags: --extern issue_85992_extern_1 --extern issue_85992_extern_2 +// aux-build: issue-85992-extern-1.rs +// aux-build: issue-85992-extern-2.rs + +issue_85992_extern_1::m!(); + +use crate::issue_85992_extern_2; +//~^ ERROR unresolved import `crate::issue_85992_extern_2` + +fn main() {} diff --git a/tests/ui/imports/issue-85992.stderr b/tests/ui/imports/issue-85992.stderr new file mode 100644 index 00000000000..810d41009c5 --- /dev/null +++ b/tests/ui/imports/issue-85992.stderr @@ -0,0 +1,9 @@ +error[E0432]: unresolved import `crate::issue_85992_extern_2` + --> $DIR/issue-85992.rs:8:5 + | +LL | use crate::issue_85992_extern_2; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `issue_85992_extern_2` in the root + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0432`. diff --git a/tests/ui/suggestions/issue-102972.rs b/tests/ui/suggestions/issue-102972.rs new file mode 100644 index 00000000000..106288b054d --- /dev/null +++ b/tests/ui/suggestions/issue-102972.rs @@ -0,0 +1,16 @@ +fn test1() { + let mut chars = "Hello".chars(); + for _c in chars.by_ref() { + chars.next(); //~ ERROR cannot borrow `chars` as mutable more than once at a time + } +} + +fn test2() { + let v = vec![1, 2, 3]; + let mut iter = v.iter(); + for _i in iter { + iter.next(); //~ ERROR borrow of moved value: `iter` + } +} + +fn main() { } diff --git a/tests/ui/suggestions/issue-102972.stderr b/tests/ui/suggestions/issue-102972.stderr new file mode 100644 index 00000000000..03f9dbb6c89 --- /dev/null +++ b/tests/ui/suggestions/issue-102972.stderr @@ -0,0 +1,33 @@ +error[E0499]: cannot borrow `chars` as mutable more than once at a time + --> $DIR/issue-102972.rs:4:9 + | +LL | for _c in chars.by_ref() { + | -------------- + | | + | first mutable borrow occurs here + | first borrow later used here +LL | chars.next(); + | ^^^^^^^^^^^^ second mutable borrow occurs here + | + = note: a for loop advances the iterator for you, the result is stored in `_c`. + = help: if you want to call `next` on a iterator within the loop, consider using `while let`. + +error[E0382]: borrow of moved value: `iter` + --> $DIR/issue-102972.rs:12:9 + | +LL | let mut iter = v.iter(); + | -------- move occurs because `iter` has type `std::slice::Iter<'_, i32>`, which does not implement the `Copy` trait +LL | for _i in iter { + | ---- `iter` moved due to this implicit call to `.into_iter()` +LL | iter.next(); + | ^^^^^^^^^^^ value borrowed here after move + | + = note: a for loop advances the iterator for you, the result is stored in `_i`. + = help: if you want to call `next` on a iterator within the loop, consider using `while let`. +note: `into_iter` takes ownership of the receiver `self`, which moves `iter` + --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL + +error: aborting due to 2 previous errors + +Some errors have detailed explanations: E0382, E0499. +For more information about an error, try `rustc --explain E0382`. |