diff options
39 files changed, 531 insertions, 160 deletions
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs index b6eb5ee183f..f73bbf3d22b 100644 --- a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs +++ b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs @@ -1499,6 +1499,11 @@ pub fn create_vtable_di_node<'ll, 'tcx>( return; } + // When full debuginfo is enabled, we want to try and prevent vtables from being + // merged. Otherwise debuggers will have a hard time mapping from dyn pointer + // to concrete type. + llvm::SetUnnamedAddress(vtable, llvm::UnnamedAddr::No); + let vtable_name = compute_debuginfo_vtable_name(cx.tcx, ty, poly_trait_ref, VTableNameKind::GlobalVariable); let vtable_type_di_node = build_vtable_type_di_node(cx, ty, poly_trait_ref); diff --git a/compiler/rustc_hir_analysis/src/astconv/mod.rs b/compiler/rustc_hir_analysis/src/astconv/mod.rs index 27284f8b983..caf26a75d3c 100644 --- a/compiler/rustc_hir_analysis/src/astconv/mod.rs +++ b/compiler/rustc_hir_analysis/src/astconv/mod.rs @@ -27,7 +27,7 @@ use rustc_hir::def::{CtorOf, DefKind, Namespace, Res}; use rustc_hir::def_id::{DefId, LocalDefId}; use rustc_hir::intravisit::{walk_generics, Visitor as _}; use rustc_hir::{GenericArg, GenericArgs, OpaqueTyOrigin}; -use rustc_infer::infer::TyCtxtInferExt; +use rustc_infer::infer::{InferCtxt, TyCtxtInferExt}; use rustc_middle::middle::stability::AllowUnstable; use rustc_middle::ty::subst::{self, GenericArgKind, InternalSubsts, SubstsRef}; use rustc_middle::ty::GenericParamDefKind; @@ -37,7 +37,7 @@ use rustc_session::lint::builtin::{AMBIGUOUS_ASSOCIATED_ITEMS, BARE_TRAIT_OBJECT use rustc_span::edition::Edition; use rustc_span::lev_distance::find_best_match_for_name; use rustc_span::symbol::{kw, Ident, Symbol}; -use rustc_span::{sym, Span}; +use rustc_span::{sym, Span, DUMMY_SP}; use rustc_target::spec::abi; use rustc_trait_selection::traits; use rustc_trait_selection::traits::astconv_object_safety_violations; @@ -54,7 +54,7 @@ use std::slice; pub struct PathSeg(pub DefId, pub usize); pub trait AstConv<'tcx> { - fn tcx<'a>(&'a self) -> TyCtxt<'tcx>; + fn tcx(&self) -> TyCtxt<'tcx>; fn item_def_id(&self) -> DefId; @@ -131,6 +131,8 @@ pub trait AstConv<'tcx> { { self } + + fn infcx(&self) -> Option<&InferCtxt<'tcx>>; } #[derive(Debug)] @@ -2132,48 +2134,8 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o { ) .emit() // Already reported in an earlier stage. } else { - // Find all the `impl`s that `qself_ty` has for any trait that has the - // associated type, so that we suggest the right one. - let infcx = tcx.infer_ctxt().build(); - // We create a fresh `ty::ParamEnv` instead of the one for `self.item_def_id()` - // to avoid a cycle error in `src/test/ui/resolve/issue-102946.rs`. - let param_env = ty::ParamEnv::empty(); - let traits: Vec<_> = self - .tcx() - .all_traits() - .filter(|trait_def_id| { - // Consider only traits with the associated type - tcx.associated_items(*trait_def_id) - .in_definition_order() - .any(|i| { - i.kind.namespace() == Namespace::TypeNS - && i.ident(tcx).normalize_to_macros_2_0() == assoc_ident - && matches!(i.kind, ty::AssocKind::Type) - }) - // Consider only accessible traits - && tcx.visibility(*trait_def_id) - .is_accessible_from(self.item_def_id(), tcx) - && tcx.all_impls(*trait_def_id) - .any(|impl_def_id| { - let trait_ref = tcx.impl_trait_ref(impl_def_id); - trait_ref.map_or(false, |trait_ref| { - let impl_ = trait_ref.subst( - tcx, - infcx.fresh_substs_for_item(span, impl_def_id), - ); - infcx - .can_eq( - param_env, - tcx.erase_regions(impl_.self_ty()), - tcx.erase_regions(qself_ty), - ) - .is_ok() - }) - && tcx.impl_polarity(impl_def_id) != ty::ImplPolarity::Negative - }) - }) - .map(|trait_def_id| tcx.def_path_str(trait_def_id)) - .collect(); + let traits: Vec<_> = + self.probe_traits_that_match_assoc_ty(qself_ty, assoc_ident); // Don't print `TyErr` to the user. self.report_ambiguous_associated_type( @@ -2232,6 +2194,60 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o { Ok((ty, DefKind::AssocTy, assoc_ty_did)) } + fn probe_traits_that_match_assoc_ty( + &self, + qself_ty: Ty<'tcx>, + assoc_ident: Ident, + ) -> Vec<String> { + let tcx = self.tcx(); + + // In contexts that have no inference context, just make a new one. + // We do need a local variable to store it, though. + let infcx_; + let infcx = if let Some(infcx) = self.infcx() { + infcx + } else { + assert!(!qself_ty.needs_infer()); + infcx_ = tcx.infer_ctxt().build(); + &infcx_ + }; + + tcx.all_traits() + .filter(|trait_def_id| { + // Consider only traits with the associated type + tcx.associated_items(*trait_def_id) + .in_definition_order() + .any(|i| { + i.kind.namespace() == Namespace::TypeNS + && i.ident(tcx).normalize_to_macros_2_0() == assoc_ident + && matches!(i.kind, ty::AssocKind::Type) + }) + // Consider only accessible traits + && tcx.visibility(*trait_def_id) + .is_accessible_from(self.item_def_id(), tcx) + && tcx.all_impls(*trait_def_id) + .any(|impl_def_id| { + let trait_ref = tcx.impl_trait_ref(impl_def_id); + trait_ref.map_or(false, |trait_ref| { + let impl_ = trait_ref.subst( + tcx, + infcx.fresh_substs_for_item(DUMMY_SP, impl_def_id), + ); + infcx + .can_eq( + ty::ParamEnv::empty(), + tcx.erase_regions(impl_.self_ty()), + tcx.erase_regions(qself_ty), + ) + .is_ok() + }) + && tcx.impl_polarity(impl_def_id) != ty::ImplPolarity::Negative + }) + }) + .map(|trait_def_id| tcx.def_path_str(trait_def_id)) + .collect() + } + fn lookup_assoc_ty( &self, ident: Ident, diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs index b73a05ff398..f5a1e51c07b 100644 --- a/compiler/rustc_hir_analysis/src/collect.rs +++ b/compiler/rustc_hir_analysis/src/collect.rs @@ -25,7 +25,7 @@ use rustc_hir as hir; use rustc_hir::def_id::{DefId, LocalDefId}; use rustc_hir::intravisit::{self, Visitor}; use rustc_hir::{GenericParamKind, Node}; -use rustc_infer::infer::TyCtxtInferExt; +use rustc_infer::infer::{InferCtxt, TyCtxtInferExt}; use rustc_infer::traits::ObligationCause; use rustc_middle::hir::nested_filter; use rustc_middle::ty::query::Providers; @@ -517,6 +517,10 @@ impl<'tcx> AstConv<'tcx> for ItemCtxt<'tcx> { fn record_ty(&self, _hir_id: hir::HirId, _ty: Ty<'tcx>, _span: Span) { // There's no place to record types from signatures? } + + fn infcx(&self) -> Option<&InferCtxt<'tcx>> { + None + } } /// Synthesize a new lifetime name that doesn't clash with any of the lifetimes already present. diff --git a/compiler/rustc_hir_analysis/src/variance/constraints.rs b/compiler/rustc_hir_analysis/src/variance/constraints.rs index a1872822d36..165782f209a 100644 --- a/compiler/rustc_hir_analysis/src/variance/constraints.rs +++ b/compiler/rustc_hir_analysis/src/variance/constraints.rs @@ -225,8 +225,7 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> { } ty::Ref(region, ty, mutbl) => { - let contra = self.contravariant(variance); - self.add_constraints_from_region(current, region, contra); + self.add_constraints_from_region(current, region, variance); self.add_constraints_from_mt(current, &ty::TypeAndMut { ty, mutbl }, variance); } @@ -258,9 +257,8 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> { } ty::Dynamic(data, r, _) => { - // The type `Foo<T+'a>` is contravariant w/r/t `'a`: - let contra = self.contravariant(variance); - self.add_constraints_from_region(current, r, contra); + // The type `dyn Trait<T> +'a` is covariant w/r/t `'a`: + self.add_constraints_from_region(current, r, variance); if let Some(poly_trait_ref) = data.principal() { self.add_constraints_from_invariant_substs( diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs index 8724e69cc51..4940015ddd5 100644 --- a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs +++ b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs @@ -324,6 +324,10 @@ impl<'a, 'tcx> AstConv<'tcx> for FnCtxt<'a, 'tcx> { let ty = if !ty.has_escaping_bound_vars() { self.normalize(span, ty) } else { ty }; self.write_ty(hir_id, ty) } + + fn infcx(&self) -> Option<&infer::InferCtxt<'tcx>> { + Some(&self.infcx) + } } /// Represents a user-provided type in the raw form (never normalized). diff --git a/compiler/rustc_infer/src/infer/glb.rs b/compiler/rustc_infer/src/infer/glb.rs index 21b68ce9989..b92b162a978 100644 --- a/compiler/rustc_infer/src/infer/glb.rs +++ b/compiler/rustc_infer/src/infer/glb.rs @@ -79,7 +79,8 @@ impl<'tcx> TypeRelation<'tcx> for Glb<'_, '_, 'tcx> { debug!("{}.regions({:?}, {:?})", self.tag(), a, b); let origin = Subtype(Box::new(self.fields.trace.clone())); - Ok(self.fields.infcx.inner.borrow_mut().unwrap_region_constraints().glb_regions( + // GLB(&'static u8, &'a u8) == &RegionLUB('static, 'a) u8 == &'static u8 + Ok(self.fields.infcx.inner.borrow_mut().unwrap_region_constraints().lub_regions( self.tcx(), origin, a, diff --git a/compiler/rustc_infer/src/infer/lub.rs b/compiler/rustc_infer/src/infer/lub.rs index c07ac1d3ace..f6e0554fd1f 100644 --- a/compiler/rustc_infer/src/infer/lub.rs +++ b/compiler/rustc_infer/src/infer/lub.rs @@ -79,7 +79,8 @@ impl<'tcx> TypeRelation<'tcx> for Lub<'_, '_, 'tcx> { debug!("{}.regions({:?}, {:?})", self.tag(), a, b); let origin = Subtype(Box::new(self.fields.trace.clone())); - Ok(self.fields.infcx.inner.borrow_mut().unwrap_region_constraints().lub_regions( + // LUB(&'static u8, &'a u8) == &RegionGLB('static, 'a) u8 == &'a u8 + Ok(self.fields.infcx.inner.borrow_mut().unwrap_region_constraints().glb_regions( self.tcx(), origin, a, diff --git a/compiler/rustc_infer/src/infer/nll_relate/mod.rs b/compiler/rustc_infer/src/infer/nll_relate/mod.rs index f235cb5ab45..f83219b8ee2 100644 --- a/compiler/rustc_infer/src/infer/nll_relate/mod.rs +++ b/compiler/rustc_infer/src/infer/nll_relate/mod.rs @@ -663,13 +663,13 @@ where debug!(?v_b); if self.ambient_covariance() { - // Covariance: a <= b. Hence, `b: a`. - self.push_outlives(v_b, v_a, self.ambient_variance_info); + // Covariant: &'a u8 <: &'b u8. Hence, `'a: 'b`. + self.push_outlives(v_a, v_b, self.ambient_variance_info); } if self.ambient_contravariance() { - // Contravariant: b <= a. Hence, `a: b`. - self.push_outlives(v_a, v_b, self.ambient_variance_info); + // Contravariant: &'b u8 <: &'a u8. Hence, `'b: 'a`. + self.push_outlives(v_b, v_a, self.ambient_variance_info); } Ok(a) diff --git a/compiler/rustc_infer/src/infer/sub.rs b/compiler/rustc_infer/src/infer/sub.rs index bd38b52ba34..51c34f0d55f 100644 --- a/compiler/rustc_infer/src/infer/sub.rs +++ b/compiler/rustc_infer/src/infer/sub.rs @@ -191,12 +191,13 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> { // from the "cause" field, we could perhaps give more tailored // error messages. let origin = SubregionOrigin::Subtype(Box::new(self.fields.trace.clone())); + // Subtype(&'a u8, &'b u8) => Outlives('a: 'b) => SubRegion('b, 'a) self.fields .infcx .inner .borrow_mut() .unwrap_region_constraints() - .make_subregion(origin, a, b); + .make_subregion(origin, b, a); Ok(a) } diff --git a/compiler/rustc_middle/src/ty/relate.rs b/compiler/rustc_middle/src/ty/relate.rs index 7122e864cf2..fa87301df7e 100644 --- a/compiler/rustc_middle/src/ty/relate.rs +++ b/compiler/rustc_middle/src/ty/relate.rs @@ -443,12 +443,7 @@ pub fn super_relate_tys<'tcx, R: TypeRelation<'tcx>>( if a_repr == b_repr => { let region_bound = relation.with_cause(Cause::ExistentialRegionBound, |relation| { - relation.relate_with_variance( - ty::Contravariant, - ty::VarianceDiagInfo::default(), - a_region, - b_region, - ) + relation.relate(a_region, b_region) })?; Ok(tcx.mk_dynamic(relation.relate(a_obj, b_obj)?, region_bound, a_repr)) } @@ -497,12 +492,7 @@ pub fn super_relate_tys<'tcx, R: TypeRelation<'tcx>>( } (&ty::Ref(a_r, a_ty, a_mutbl), &ty::Ref(b_r, b_ty, b_mutbl)) => { - let r = relation.relate_with_variance( - ty::Contravariant, - ty::VarianceDiagInfo::default(), - a_r, - b_r, - )?; + let r = relation.relate(a_r, b_r)?; let a_mt = ty::TypeAndMut { ty: a_ty, mutbl: a_mutbl }; let b_mt = ty::TypeAndMut { ty: b_ty, mutbl: b_mutbl }; let mt = relate_type_and_mut(relation, a_mt, b_mt, a)?; diff --git a/compiler/rustc_parse/src/parser/diagnostics.rs b/compiler/rustc_parse/src/parser/diagnostics.rs index eda7046c748..f4c08031bcc 100644 --- a/compiler/rustc_parse/src/parser/diagnostics.rs +++ b/compiler/rustc_parse/src/parser/diagnostics.rs @@ -2353,6 +2353,28 @@ impl<'a> Parser<'a> { Err(err) } + /// Try to recover from an unbraced const argument whose first token [could begin a type][ty]. + /// + /// [ty]: token::Token::can_begin_type + pub(crate) fn recover_unbraced_const_arg_that_can_begin_ty( + &mut self, + mut snapshot: SnapshotParser<'a>, + ) -> Option<P<ast::Expr>> { + match snapshot.parse_expr_res(Restrictions::CONST_EXPR, None) { + // Since we don't know the exact reason why we failed to parse the type or the + // expression, employ a simple heuristic to weed out some pathological cases. + Ok(expr) if let token::Comma | token::Gt = snapshot.token.kind => { + self.restore_snapshot(snapshot); + Some(expr) + } + Ok(_) => None, + Err(err) => { + err.cancel(); + None + } + } + } + /// Creates a dummy const argument, and reports that the expression must be enclosed in braces pub fn dummy_const_arg_needs_braces( &self, diff --git a/compiler/rustc_parse/src/parser/path.rs b/compiler/rustc_parse/src/parser/path.rs index 5333d3b8587..2e706a00cf7 100644 --- a/compiler/rustc_parse/src/parser/path.rs +++ b/compiler/rustc_parse/src/parser/path.rs @@ -675,22 +675,42 @@ impl<'a> Parser<'a> { GenericArg::Const(self.parse_const_arg()?) } else if self.check_type() { // Parse type argument. - let is_const_fn = - self.look_ahead(1, |t| t.kind == token::OpenDelim(Delimiter::Parenthesis)); - let mut snapshot = self.create_snapshot_for_diagnostic(); + + // Proactively create a parser snapshot enabling us to rewind and try to reparse the + // input as a const expression in case we fail to parse a type. If we successfully + // do so, we will report an error that it needs to be wrapped in braces. + let mut snapshot = None; + if self.may_recover() && self.token.can_begin_expr() { + snapshot = Some(self.create_snapshot_for_diagnostic()); + } + match self.parse_ty() { - Ok(ty) => GenericArg::Type(ty), + Ok(ty) => { + // Since the type parser recovers from some malformed slice and array types and + // successfully returns a type, we need to look for `TyKind::Err`s in the + // type to determine if error recovery has occurred and if the input is not a + // syntactically valid type after all. + if let ast::TyKind::Slice(inner_ty) | ast::TyKind::Array(inner_ty, _) = &ty.kind + && let ast::TyKind::Err = inner_ty.kind + && let Some(snapshot) = snapshot + && let Some(expr) = self.recover_unbraced_const_arg_that_can_begin_ty(snapshot) + { + return Ok(Some(self.dummy_const_arg_needs_braces( + self.struct_span_err(expr.span, "invalid const generic expression"), + expr.span, + ))); + } + + GenericArg::Type(ty) + } Err(err) => { - if is_const_fn { - match (*snapshot).parse_expr_res(Restrictions::CONST_EXPR, None) { - Ok(expr) => { - self.restore_snapshot(snapshot); - return Ok(Some(self.dummy_const_arg_needs_braces(err, expr.span))); - } - Err(err) => { - err.cancel(); - } - } + if let Some(snapshot) = snapshot + && let Some(expr) = self.recover_unbraced_const_arg_that_can_begin_ty(snapshot) + { + return Ok(Some(self.dummy_const_arg_needs_braces( + err, + expr.span, + ))); } // Try to recover from possible `const` arg without braces. return self.recover_const_arg(start, err).map(Some); diff --git a/compiler/rustc_trait_selection/src/solve/assembly.rs b/compiler/rustc_trait_selection/src/solve/assembly.rs index 0c18fc355e9..f7cf81da497 100644 --- a/compiler/rustc_trait_selection/src/solve/assembly.rs +++ b/compiler/rustc_trait_selection/src/solve/assembly.rs @@ -1,6 +1,8 @@ //! Code shared by trait and projection goals for candidate assembly. use super::infcx_ext::InferCtxtExt; +#[cfg(doc)] +use super::trait_goals::structural_traits::*; use super::{CanonicalResponse, Certainty, EvalCtxt, Goal, QueryResult}; use rustc_hir::def_id::DefId; use rustc_infer::traits::query::NoSolution; @@ -98,52 +100,75 @@ pub(super) trait GoalKind<'tcx>: TypeFoldable<'tcx> + Copy + Eq { assumption: ty::Predicate<'tcx>, ) -> QueryResult<'tcx>; + // A type implements an `auto trait` if its components do as well. These components + // are given by built-in rules from [`instantiate_constituent_tys_for_auto_trait`]. fn consider_auto_trait_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A trait alias holds if the RHS traits and `where` clauses hold. fn consider_trait_alias_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A type is `Copy` or `Clone` if its components are `Sized`. These components + // are given by built-in rules from [`instantiate_constituent_tys_for_sized_trait`]. fn consider_builtin_sized_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A type is `Copy` or `Clone` if its components are `Copy` or `Clone`. These + // components are given by built-in rules from [`instantiate_constituent_tys_for_copy_clone_trait`]. fn consider_builtin_copy_clone_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A type is `PointerSized` if we can compute its layout, and that layout + // matches the layout of `usize`. fn consider_builtin_pointer_sized_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A callable type (a closure, fn def, or fn ptr) is known to implement the `Fn<A>` + // family of traits where `A` is given by the signature of the type. fn consider_builtin_fn_trait_candidates( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, kind: ty::ClosureKind, ) -> QueryResult<'tcx>; + // `Tuple` is implemented if the `Self` type is a tuple. fn consider_builtin_tuple_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // `Pointee` is always implemented. + // + // See the projection implementation for the `Metadata` types for all of + // the built-in types. For structs, the metadata type is given by the struct + // tail. fn consider_builtin_pointee_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A generator (that comes from an `async` desugaring) is known to implement + // `Future<Output = O>`, where `O` is given by the generator's return type + // that was computed during type-checking. fn consider_builtin_future_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, ) -> QueryResult<'tcx>; + // A generator (that doesn't come from an `async` desugaring) is known to + // implement `Generator<R, Yield = Y, Return = O>`, given the resume, yield, + // and return types of the generator computed during type-checking. fn consider_builtin_generator_candidate( ecx: &mut EvalCtxt<'_, 'tcx>, goal: Goal<'tcx, Self>, diff --git a/compiler/rustc_trait_selection/src/solve/mod.rs b/compiler/rustc_trait_selection/src/solve/mod.rs index 7880cbad5fe..e240dd5a225 100644 --- a/compiler/rustc_trait_selection/src/solve/mod.rs +++ b/compiler/rustc_trait_selection/src/solve/mod.rs @@ -335,15 +335,13 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> { // That won't actually reflect in the query response, so it seems moot. self.make_canonical_response(Certainty::AMBIGUOUS) } else { - self.infcx.probe(|_| { - let InferOk { value: (), obligations } = self - .infcx - .at(&ObligationCause::dummy(), goal.param_env) - .sub(goal.predicate.a, goal.predicate.b)?; - self.evaluate_all_and_make_canonical_response( - obligations.into_iter().map(|pred| pred.into()).collect(), - ) - }) + let InferOk { value: (), obligations } = self + .infcx + .at(&ObligationCause::dummy(), goal.param_env) + .sub(goal.predicate.a, goal.predicate.b)?; + self.evaluate_all_and_make_canonical_response( + obligations.into_iter().map(|pred| pred.into()).collect(), + ) } } @@ -376,22 +374,22 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> { &mut self, goal: Goal<'tcx, ty::GenericArg<'tcx>>, ) -> QueryResult<'tcx> { - self.infcx.probe(|_| { - match crate::traits::wf::unnormalized_obligations( - self.infcx, - goal.param_env, - goal.predicate, - ) { - Some(obligations) => self.evaluate_all_and_make_canonical_response( - obligations.into_iter().map(|o| o.into()).collect(), - ), - None => self.make_canonical_response(Certainty::AMBIGUOUS), - } - }) + match crate::traits::wf::unnormalized_obligations( + self.infcx, + goal.param_env, + goal.predicate, + ) { + Some(obligations) => self.evaluate_all_and_make_canonical_response( + obligations.into_iter().map(|o| o.into()).collect(), + ), + None => self.make_canonical_response(Certainty::AMBIGUOUS), + } } } impl<'tcx> EvalCtxt<'_, 'tcx> { + // Recursively evaluates a list of goals to completion, returning the certainty + // of all of the goals. fn evaluate_all( &mut self, mut goals: Vec<Goal<'tcx, ty::Predicate<'tcx>>>, @@ -428,6 +426,10 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { }) } + // Recursively evaluates a list of goals to completion, making a query response. + // + // This is just a convenient way of calling [`EvalCtxt::evaluate_all`], + // then [`EvalCtxt::make_canonical_response`]. fn evaluate_all_and_make_canonical_response( &mut self, goals: Vec<Goal<'tcx, ty::Predicate<'tcx>>>, diff --git a/compiler/rustc_trait_selection/src/solve/project_goals.rs b/compiler/rustc_trait_selection/src/solve/project_goals.rs index 518d6fff938..638efaa2ba5 100644 --- a/compiler/rustc_trait_selection/src/solve/project_goals.rs +++ b/compiler/rustc_trait_selection/src/solve/project_goals.rs @@ -296,7 +296,9 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> { goal: Goal<'tcx, Self>, assumption: ty::Predicate<'tcx>, ) -> QueryResult<'tcx> { - if let Some(poly_projection_pred) = assumption.to_opt_poly_projection_pred() { + if let Some(poly_projection_pred) = assumption.to_opt_poly_projection_pred() + && poly_projection_pred.projection_def_id() == goal.predicate.def_id() + { ecx.infcx.probe(|_| { let assumption_projection_pred = ecx.infcx.instantiate_bound_vars_with_infer(poly_projection_pred); diff --git a/compiler/rustc_trait_selection/src/solve/trait_goals.rs b/compiler/rustc_trait_selection/src/solve/trait_goals.rs index d74857dc4b4..45b6a5f4ec5 100644 --- a/compiler/rustc_trait_selection/src/solve/trait_goals.rs +++ b/compiler/rustc_trait_selection/src/solve/trait_goals.rs @@ -65,7 +65,9 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> { goal: Goal<'tcx, Self>, assumption: ty::Predicate<'tcx>, ) -> QueryResult<'tcx> { - if let Some(poly_trait_pred) = assumption.to_opt_poly_trait_pred() { + if let Some(poly_trait_pred) = assumption.to_opt_poly_trait_pred() + && poly_trait_pred.def_id() == goal.predicate.def_id() + { // FIXME: Constness and polarity ecx.infcx.probe(|_| { let assumption_trait_pred = diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs index f7f787dea95..26c0b3beb37 100644 --- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs +++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs @@ -3807,13 +3807,13 @@ fn hint_missing_borrow<'tcx>( err: &mut Diagnostic, ) { let found_args = match found.kind() { - ty::FnPtr(f) => f.inputs().skip_binder().iter(), + ty::FnPtr(f) => infcx.replace_bound_vars_with_placeholders(*f).inputs().iter(), kind => { span_bug!(span, "found was converted to a FnPtr above but is now {:?}", kind) } }; let expected_args = match expected.kind() { - ty::FnPtr(f) => f.inputs().skip_binder().iter(), + ty::FnPtr(f) => infcx.replace_bound_vars_with_placeholders(*f).inputs().iter(), kind => { span_bug!(span, "expected was converted to a FnPtr above but is now {:?}", kind) } @@ -3824,12 +3824,12 @@ fn hint_missing_borrow<'tcx>( let args = fn_decl.inputs.iter().map(|ty| ty); - fn get_deref_type_and_refs(mut ty: Ty<'_>) -> (Ty<'_>, usize) { - let mut refs = 0; + fn get_deref_type_and_refs(mut ty: Ty<'_>) -> (Ty<'_>, Vec<hir::Mutability>) { + let mut refs = vec![]; - while let ty::Ref(_, new_ty, _) = ty.kind() { + while let ty::Ref(_, new_ty, mutbl) = ty.kind() { ty = *new_ty; - refs += 1; + refs.push(*mutbl); } (ty, refs) @@ -3843,11 +3843,21 @@ fn hint_missing_borrow<'tcx>( let (expected_ty, expected_refs) = get_deref_type_and_refs(*expected_arg); if infcx.can_eq(param_env, found_ty, expected_ty).is_ok() { - if found_refs < expected_refs { - to_borrow.push((arg.span.shrink_to_lo(), "&".repeat(expected_refs - found_refs))); - } else if found_refs > expected_refs { + // FIXME: This could handle more exotic cases like mutability mismatches too! + if found_refs.len() < expected_refs.len() + && found_refs[..] == expected_refs[expected_refs.len() - found_refs.len()..] + { + to_borrow.push(( + arg.span.shrink_to_lo(), + expected_refs[..expected_refs.len() - found_refs.len()] + .iter() + .map(|mutbl| format!("&{}", mutbl.prefix_str())) + .collect::<Vec<_>>() + .join(""), + )); + } else if found_refs.len() > expected_refs.len() { let mut span = arg.span.shrink_to_lo(); - let mut left = found_refs - expected_refs; + let mut left = found_refs.len() - expected_refs.len(); let mut ty = arg; while let hir::TyKind::Ref(_, mut_ty) = &ty.kind && left > 0 { span = span.with_hi(mut_ty.ty.span.lo()); diff --git a/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs b/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs index 09b58894d30..f183248f2d0 100644 --- a/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs +++ b/compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs @@ -1,7 +1,9 @@ use rustc_middle::ty; +use rustc_session::config::TraitSolver; use crate::infer::canonical::OriginalQueryValues; use crate::infer::InferCtxt; +use crate::solve::{Certainty, Goal, InferCtxtEvalExt, MaybeCause}; use crate::traits::{EvaluationResult, OverflowError, PredicateObligation, SelectionContext}; pub trait InferCtxtExt<'tcx> { @@ -77,12 +79,38 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> { _ => obligation.param_env.without_const(), }; - let c_pred = self - .canonicalize_query_keep_static(param_env.and(obligation.predicate), &mut _orig_values); - // Run canonical query. If overflow occurs, rerun from scratch but this time - // in standard trait query mode so that overflow is handled appropriately - // within `SelectionContext`. - self.tcx.at(obligation.cause.span()).evaluate_obligation(c_pred) + if self.tcx.sess.opts.unstable_opts.trait_solver != TraitSolver::Next { + let c_pred = self.canonicalize_query_keep_static( + param_env.and(obligation.predicate), + &mut _orig_values, + ); + self.tcx.at(obligation.cause.span()).evaluate_obligation(c_pred) + } else { + self.probe(|snapshot| { + if let Ok((_, certainty)) = + self.evaluate_root_goal(Goal::new(self.tcx, param_env, obligation.predicate)) + { + match certainty { + Certainty::Yes => { + if self.opaque_types_added_in_snapshot(snapshot) { + Ok(EvaluationResult::EvaluatedToOkModuloOpaqueTypes) + } else if self.region_constraints_added_in_snapshot(snapshot).is_some() + { + Ok(EvaluationResult::EvaluatedToOkModuloRegions) + } else { + Ok(EvaluationResult::EvaluatedToOk) + } + } + Certainty::Maybe(MaybeCause::Ambiguity) => { + Ok(EvaluationResult::EvaluatedToAmbig) + } + Certainty::Maybe(MaybeCause::Overflow) => Err(OverflowError::Canonical), + } + } else { + Ok(EvaluationResult::EvaluatedToErr) + } + }) + } } // Helper function that canonicalizes and runs the query. If an @@ -92,6 +120,9 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> { &self, obligation: &PredicateObligation<'tcx>, ) -> EvaluationResult { + // Run canonical query. If overflow occurs, rerun from scratch but this time + // in standard trait query mode so that overflow is handled appropriately + // within `SelectionContext`. match self.evaluate_obligation(obligation) { Ok(result) => result, Err(OverflowError::Canonical) => { diff --git a/library/core/src/option.rs b/library/core/src/option.rs index 7cc00e3f8d1..c43b728022d 100644 --- a/library/core/src/option.rs +++ b/library/core/src/option.rs @@ -551,7 +551,7 @@ use crate::marker::Destruct; use crate::panicking::{panic, panic_str}; use crate::pin::Pin; use crate::{ - convert, hint, mem, + cmp, convert, hint, mem, ops::{self, ControlFlow, Deref, DerefMut}, }; @@ -2090,6 +2090,12 @@ impl<T: PartialEq> PartialEq for Option<T> { } } +/// This specialization trait is a workaround for LLVM not currently (2023-01) +/// being able to optimize this itself, even though Alive confirms that it would +/// be legal to do so: <https://github.com/llvm/llvm-project/issues/52622> +/// +/// Once that's fixed, `Option` should go back to deriving `PartialEq`, as +/// it used to do before <https://github.com/rust-lang/rust/pull/103556>. #[unstable(feature = "spec_option_partial_eq", issue = "none", reason = "exposed only for rustc")] #[doc(hidden)] pub trait SpecOptionPartialEq: Sized { @@ -2146,6 +2152,14 @@ impl<T> SpecOptionPartialEq for crate::ptr::NonNull<T> { } } +#[stable(feature = "rust1", since = "1.0.0")] +impl SpecOptionPartialEq for cmp::Ordering { + #[inline] + fn eq(l: &Option<Self>, r: &Option<Self>) -> bool { + l.map_or(2, |x| x as i8) == r.map_or(2, |x| x as i8) + } +} + ///////////////////////////////////////////////////////////////////////////// // The Option Iterators ///////////////////////////////////////////////////////////////////////////// diff --git a/tests/codegen/debug-vtable.rs b/tests/codegen/debug-vtable.rs index bdd312878ec..d82b737de0b 100644 --- a/tests/codegen/debug-vtable.rs +++ b/tests/codegen/debug-vtable.rs @@ -9,6 +9,14 @@ // compile-flags: -Cdebuginfo=2 -Copt-level=0 -Csymbol-mangling-version=v0 // ignore-tidy-linelength +// Make sure that vtables don't have the unnamed_addr attribute when debuginfo is enabled. +// This helps debuggers more reliably map from dyn pointer to concrete type. +// CHECK: @vtable.0 = private constant <{ +// CHECK: @vtable.1 = private constant <{ +// CHECK: @vtable.2 = private constant <{ +// CHECK: @vtable.3 = private constant <{ +// CHECK: @vtable.4 = private constant <{ + // NONMSVC: ![[USIZE:[0-9]+]] = !DIBasicType(name: "usize" // MSVC: ![[USIZE:[0-9]+]] = !DIDerivedType(tag: DW_TAG_typedef, name: "usize" // NONMSVC: ![[PTR:[0-9]+]] = !DIDerivedType(tag: DW_TAG_pointer_type, name: "*const ()" diff --git a/tests/codegen/option-nonzero-eq.rs b/tests/codegen/option-nonzero-eq.rs index 598dcc19b49..835decd3e5f 100644 --- a/tests/codegen/option-nonzero-eq.rs +++ b/tests/codegen/option-nonzero-eq.rs @@ -3,6 +3,7 @@ #![crate_type = "lib"] extern crate core; +use core::cmp::Ordering; use core::num::{NonZeroU32, NonZeroI64}; use core::ptr::NonNull; @@ -32,3 +33,12 @@ pub fn non_null_eq(l: Option<NonNull<u8>>, r: Option<NonNull<u8>>) -> bool { // CHECK-NEXT: ret i1 l == r } + +// CHECK-lABEL: @ordering_eq +#[no_mangle] +pub fn ordering_eq(l: Option<Ordering>, r: Option<Ordering>) -> bool { + // CHECK: start: + // CHECK-NEXT: icmp eq i8 + // CHECK-NEXT: ret i1 + l == r +} diff --git a/tests/ui/const-generics/bad-const-generic-exprs.rs b/tests/ui/const-generics/bad-const-generic-exprs.rs index ca91643edf7..423752ca25e 100644 --- a/tests/ui/const-generics/bad-const-generic-exprs.rs +++ b/tests/ui/const-generics/bad-const-generic-exprs.rs @@ -13,10 +13,34 @@ fn main() { let _: Wow<A.0>; //~^ ERROR expected one of //~| HELP expressions must be enclosed in braces to be used as const generic arguments - - // FIXME(compiler-errors): This one is still unsatisfying, - // and probably a case I could see someone typing by accident.. + let _: Wow<[]>; + //~^ ERROR expected type + //~| HELP expressions must be enclosed in braces to be used as const generic arguments let _: Wow<[12]>; - //~^ ERROR expected type, found - //~| ERROR type provided when a constant was expected + //~^ ERROR expected type + //~| ERROR invalid const generic expression + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + let _: Wow<[0, 1, 3]>; + //~^ ERROR expected type + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + let _: Wow<[0xff; 8]>; + //~^ ERROR expected type + //~| ERROR invalid const generic expression + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + let _: Wow<[1, 2]>; // Regression test for issue #81698. + //~^ ERROR expected type + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + let _: Wow<&0>; + //~^ ERROR expected type + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + let _: Wow<("", 0)>; + //~^ ERROR expected type + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + let _: Wow<(1 + 2) * 3>; + //~^ ERROR expected type + //~| HELP expressions must be enclosed in braces to be used as const generic arguments + // FIXME(fmease): This one is pretty bad. + let _: Wow<!0>; + //~^ ERROR expected one of + //~| HELP you might have meant to end the type parameters here } diff --git a/tests/ui/const-generics/bad-const-generic-exprs.stderr b/tests/ui/const-generics/bad-const-generic-exprs.stderr index 24668b08b8a..17a63a96fe4 100644 --- a/tests/ui/const-generics/bad-const-generic-exprs.stderr +++ b/tests/ui/const-generics/bad-const-generic-exprs.stderr @@ -42,18 +42,118 @@ help: expressions must be enclosed in braces to be used as const generic argumen LL | let _: Wow<{ A.0 }>; | + + +error: expected type, found `]` + --> $DIR/bad-const-generic-exprs.rs:16:17 + | +LL | let _: Wow<[]>; + | ^ expected type + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ [] }>; + | + + + error: expected type, found `12` --> $DIR/bad-const-generic-exprs.rs:19:17 | LL | let _: Wow<[12]>; | ^^ expected type -error[E0747]: type provided when a constant was expected +error: invalid const generic expression --> $DIR/bad-const-generic-exprs.rs:19:16 | LL | let _: Wow<[12]>; | ^^^^ + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ [12] }>; + | + + + +error: expected type, found `0` + --> $DIR/bad-const-generic-exprs.rs:23:17 + | +LL | let _: Wow<[0, 1, 3]>; + | ^ expected type + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ [0, 1, 3] }>; + | + + + +error: expected type, found `0xff` + --> $DIR/bad-const-generic-exprs.rs:26:17 + | +LL | let _: Wow<[0xff; 8]>; + | ^^^^ expected type + +error: invalid const generic expression + --> $DIR/bad-const-generic-exprs.rs:26:16 + | +LL | let _: Wow<[0xff; 8]>; + | ^^^^^^^^^ + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ [0xff; 8] }>; + | + + + +error: expected type, found `1` + --> $DIR/bad-const-generic-exprs.rs:30:17 + | +LL | let _: Wow<[1, 2]>; // Regression test for issue #81698. + | ^ expected type + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ [1, 2] }>; // Regression test for issue #81698. + | + + + +error: expected type, found `0` + --> $DIR/bad-const-generic-exprs.rs:33:17 + | +LL | let _: Wow<&0>; + | ^ expected type + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ &0 }>; + | + + + +error: expected type, found `""` + --> $DIR/bad-const-generic-exprs.rs:36:17 + | +LL | let _: Wow<("", 0)>; + | ^^ expected type + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ ("", 0) }>; + | + + + +error: expected type, found `1` + --> $DIR/bad-const-generic-exprs.rs:39:17 + | +LL | let _: Wow<(1 + 2) * 3>; + | ^ expected type + | +help: expressions must be enclosed in braces to be used as const generic arguments + | +LL | let _: Wow<{ (1 + 2) * 3 }>; + | + + + +error: expected one of `,` or `>`, found `0` + --> $DIR/bad-const-generic-exprs.rs:43:17 + | +LL | let _: Wow<!0>; + | - ^ expected one of `,` or `>` + | | + | while parsing the type for `_` + | +help: you might have meant to end the type parameters here + | +LL | let _: Wow<!>0>; + | + -error: aborting due to 6 previous errors +error: aborting due to 15 previous errors -For more information about this error, try `rustc --explain E0747`. diff --git a/tests/ui/error-codes/E0208.rs b/tests/ui/error-codes/E0208.rs index c67d42889d6..74c138af483 100644 --- a/tests/ui/error-codes/E0208.rs +++ b/tests/ui/error-codes/E0208.rs @@ -1,7 +1,7 @@ #![feature(rustc_attrs)] #[rustc_variance] -struct Foo<'a, T> { //~ ERROR [-, o] +struct Foo<'a, T> { //~ ERROR [+, o] t: &'a mut T, } diff --git a/tests/ui/error-codes/E0208.stderr b/tests/ui/error-codes/E0208.stderr index dbbb41e7950..2c7072a7e76 100644 --- a/tests/ui/error-codes/E0208.stderr +++ b/tests/ui/error-codes/E0208.stderr @@ -1,4 +1,4 @@ -error: [-, o] +error: [+, o] --> $DIR/E0208.rs:4:1 | LL | struct Foo<'a, T> { diff --git a/tests/ui/suggestions/late-bound-in-borrow-closure-sugg.rs b/tests/ui/suggestions/late-bound-in-borrow-closure-sugg.rs new file mode 100644 index 00000000000..3bf6b7bb9b1 --- /dev/null +++ b/tests/ui/suggestions/late-bound-in-borrow-closure-sugg.rs @@ -0,0 +1,28 @@ +use std::cell::RefCell; +use std::collections::HashMap; +use std::rc::Rc; + +pub struct Trader<'a> { + closure: Box<dyn Fn(&mut Trader) + 'a>, +} + +impl<'a> Trader<'a> { + pub fn new() -> Self { + Trader { + closure: Box::new(|_| {}), + } + } + pub fn set_closure(&mut self, function: impl Fn(&mut Trader) + 'a) { + //foo + } +} + +fn main() { + let closure = |trader : Trader| { + println!("Woooosh!"); + }; + + let mut trader = Trader::new(); + trader.set_closure(closure); + //~^ ERROR type mismatch in closure arguments +} diff --git a/tests/ui/suggestions/late-bound-in-borrow-closure-sugg.stderr b/tests/ui/suggestions/late-bound-in-borrow-closure-sugg.stderr new file mode 100644 index 00000000000..6820af1fd45 --- /dev/null +++ b/tests/ui/suggestions/late-bound-in-borrow-closure-sugg.stderr @@ -0,0 +1,26 @@ +error[E0631]: type mismatch in closure arguments + --> $DIR/late-bound-in-borrow-closure-sugg.rs:26:24 + | +LL | let closure = |trader : Trader| { + | ----------------- found signature defined here +... +LL | trader.set_closure(closure); + | ----------- ^^^^^^^ expected due to this + | | + | required by a bound introduced by this call + | + = note: expected closure signature `for<'a, 'b> fn(&'a mut Trader<'b>) -> _` + found closure signature `for<'a> fn(Trader<'a>) -> _` +note: required by a bound in `Trader::<'a>::set_closure` + --> $DIR/late-bound-in-borrow-closure-sugg.rs:15:50 + | +LL | pub fn set_closure(&mut self, function: impl Fn(&mut Trader) + 'a) { + | ^^^^^^^^^^^^^^^ required by this bound in `Trader::<'a>::set_closure` +help: consider borrowing the argument + | +LL | let closure = |trader : &mut Trader| { + | ++++ + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0631`. diff --git a/tests/ui/typeck/issue-107087.rs b/tests/ui/typeck/issue-107087.rs new file mode 100644 index 00000000000..135cdf19e3e --- /dev/null +++ b/tests/ui/typeck/issue-107087.rs @@ -0,0 +1,18 @@ +struct A<T>(T); + +trait Foo { + type B; +} + +impl Foo for A<u32> { + type B = i32; +} + +impl Foo for A<i32> { + type B = i32; +} + +fn main() { + A::B::<>::C + //~^ ERROR ambiguous associated type +} diff --git a/tests/ui/typeck/issue-107087.stderr b/tests/ui/typeck/issue-107087.stderr new file mode 100644 index 00000000000..70f19320802 --- /dev/null +++ b/tests/ui/typeck/issue-107087.stderr @@ -0,0 +1,9 @@ +error[E0223]: ambiguous associated type + --> $DIR/issue-107087.rs:16:5 + | +LL | A::B::<>::C + | ^^^^^^^^ help: use the fully-qualified path: `<A<_> as Foo>::B` + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0223`. diff --git a/tests/ui/variance/variance-associated-types.rs b/tests/ui/variance/variance-associated-types.rs index 1165fb53c73..ecb0821827d 100644 --- a/tests/ui/variance/variance-associated-types.rs +++ b/tests/ui/variance/variance-associated-types.rs @@ -10,7 +10,7 @@ trait Trait<'a> { } #[rustc_variance] -struct Foo<'a, T : Trait<'a>> { //~ ERROR [-, +] +struct Foo<'a, T : Trait<'a>> { //~ ERROR [+, +] field: (T, &'a ()) } diff --git a/tests/ui/variance/variance-associated-types.stderr b/tests/ui/variance/variance-associated-types.stderr index 51f17c7c228..70cb246f6e9 100644 --- a/tests/ui/variance/variance-associated-types.stderr +++ b/tests/ui/variance/variance-associated-types.stderr @@ -1,4 +1,4 @@ -error: [-, +] +error: [+, +] --> $DIR/variance-associated-types.rs:13:1 | LL | struct Foo<'a, T : Trait<'a>> { diff --git a/tests/ui/variance/variance-regions-direct.rs b/tests/ui/variance/variance-regions-direct.rs index 3f34e7655f3..39ea77a8aa2 100644 --- a/tests/ui/variance/variance-regions-direct.rs +++ b/tests/ui/variance/variance-regions-direct.rs @@ -6,7 +6,7 @@ // Regions that just appear in normal spots are contravariant: #[rustc_variance] -struct Test2<'a, 'b, 'c> { //~ ERROR [-, -, -] +struct Test2<'a, 'b, 'c> { //~ ERROR [+, +, +] x: &'a isize, y: &'b [isize], c: &'c str @@ -15,7 +15,7 @@ struct Test2<'a, 'b, 'c> { //~ ERROR [-, -, -] // Those same annotations in function arguments become covariant: #[rustc_variance] -struct Test3<'a, 'b, 'c> { //~ ERROR [+, +, +] +struct Test3<'a, 'b, 'c> { //~ ERROR [-, -, -] x: extern "Rust" fn(&'a isize), y: extern "Rust" fn(&'b [isize]), c: extern "Rust" fn(&'c str), @@ -24,7 +24,7 @@ struct Test3<'a, 'b, 'c> { //~ ERROR [+, +, +] // Mutability induces invariance: #[rustc_variance] -struct Test4<'a, 'b:'a> { //~ ERROR [-, o] +struct Test4<'a, 'b:'a> { //~ ERROR [+, o] x: &'a mut &'b isize, } @@ -32,7 +32,7 @@ struct Test4<'a, 'b:'a> { //~ ERROR [-, o] // contravariant context: #[rustc_variance] -struct Test5<'a, 'b:'a> { //~ ERROR [+, o] +struct Test5<'a, 'b:'a> { //~ ERROR [-, o] x: extern "Rust" fn(&'a mut &'b isize), } @@ -42,7 +42,7 @@ struct Test5<'a, 'b:'a> { //~ ERROR [+, o] // argument list occurs in an invariant context. #[rustc_variance] -struct Test6<'a, 'b:'a> { //~ ERROR [-, o] +struct Test6<'a, 'b:'a> { //~ ERROR [+, o] x: &'a mut extern "Rust" fn(&'b isize), } @@ -56,7 +56,7 @@ struct Test7<'a> { //~ ERROR [*] // Try enums too. #[rustc_variance] -enum Test8<'a, 'b, 'c:'b> { //~ ERROR [+, -, o] +enum Test8<'a, 'b, 'c:'b> { //~ ERROR [-, +, o] Test8A(extern "Rust" fn(&'a isize)), Test8B(&'b [isize]), Test8C(&'b mut &'c str), diff --git a/tests/ui/variance/variance-regions-direct.stderr b/tests/ui/variance/variance-regions-direct.stderr index eda02e9b03b..c55730296f1 100644 --- a/tests/ui/variance/variance-regions-direct.stderr +++ b/tests/ui/variance/variance-regions-direct.stderr @@ -1,28 +1,28 @@ -error: [-, -, -] +error: [+, +, +] --> $DIR/variance-regions-direct.rs:9:1 | LL | struct Test2<'a, 'b, 'c> { | ^^^^^^^^^^^^^^^^^^^^^^^^ -error: [+, +, +] +error: [-, -, -] --> $DIR/variance-regions-direct.rs:18:1 | LL | struct Test3<'a, 'b, 'c> { | ^^^^^^^^^^^^^^^^^^^^^^^^ -error: [-, o] +error: [+, o] --> $DIR/variance-regions-direct.rs:27:1 | LL | struct Test4<'a, 'b:'a> { | ^^^^^^^^^^^^^^^^^^^^^^^ -error: [+, o] +error: [-, o] --> $DIR/variance-regions-direct.rs:35:1 | LL | struct Test5<'a, 'b:'a> { | ^^^^^^^^^^^^^^^^^^^^^^^ -error: [-, o] +error: [+, o] --> $DIR/variance-regions-direct.rs:45:1 | LL | struct Test6<'a, 'b:'a> { @@ -34,7 +34,7 @@ error: [*] LL | struct Test7<'a> { | ^^^^^^^^^^^^^^^^ -error: [+, -, o] +error: [-, +, o] --> $DIR/variance-regions-direct.rs:59:1 | LL | enum Test8<'a, 'b, 'c:'b> { diff --git a/tests/ui/variance/variance-regions-indirect.rs b/tests/ui/variance/variance-regions-indirect.rs index f84f25ada14..0d00535fef1 100644 --- a/tests/ui/variance/variance-regions-indirect.rs +++ b/tests/ui/variance/variance-regions-indirect.rs @@ -5,14 +5,14 @@ #![feature(rustc_attrs)] #[rustc_variance] -enum Base<'a, 'b, 'c:'b, 'd> { //~ ERROR [+, -, o, *] +enum Base<'a, 'b, 'c:'b, 'd> { //~ ERROR [-, +, o, *] Test8A(extern "Rust" fn(&'a isize)), Test8B(&'b [isize]), Test8C(&'b mut &'c str), } #[rustc_variance] -struct Derived1<'w, 'x:'y, 'y, 'z> { //~ ERROR [*, o, -, +] +struct Derived1<'w, 'x:'y, 'y, 'z> { //~ ERROR [*, o, +, -] f: Base<'z, 'y, 'x, 'w> } @@ -22,12 +22,12 @@ struct Derived2<'a, 'b:'a, 'c> { //~ ERROR [o, o, *] } #[rustc_variance] // Combine + and o to yield o (just pay attention to 'a here) -struct Derived3<'a:'b, 'b, 'c> { //~ ERROR [o, -, *] +struct Derived3<'a:'b, 'b, 'c> { //~ ERROR [o, +, *] f: Base<'a, 'b, 'a, 'c> } #[rustc_variance] // Combine + and * to yield + (just pay attention to 'a here) -struct Derived4<'a, 'b, 'c:'b> { //~ ERROR [+, -, o] +struct Derived4<'a, 'b, 'c:'b> { //~ ERROR [-, +, o] f: Base<'a, 'b, 'c, 'a> } diff --git a/tests/ui/variance/variance-regions-indirect.stderr b/tests/ui/variance/variance-regions-indirect.stderr index fa2f4d507f3..edf2626d598 100644 --- a/tests/ui/variance/variance-regions-indirect.stderr +++ b/tests/ui/variance/variance-regions-indirect.stderr @@ -1,10 +1,10 @@ -error: [+, -, o, *] +error: [-, +, o, *] --> $DIR/variance-regions-indirect.rs:8:1 | LL | enum Base<'a, 'b, 'c:'b, 'd> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: [*, o, -, +] +error: [*, o, +, -] --> $DIR/variance-regions-indirect.rs:15:1 | LL | struct Derived1<'w, 'x:'y, 'y, 'z> { @@ -16,13 +16,13 @@ error: [o, o, *] LL | struct Derived2<'a, 'b:'a, 'c> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: [o, -, *] +error: [o, +, *] --> $DIR/variance-regions-indirect.rs:25:1 | LL | struct Derived3<'a:'b, 'b, 'c> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: [+, -, o] +error: [-, +, o] --> $DIR/variance-regions-indirect.rs:30:1 | LL | struct Derived4<'a, 'b, 'c:'b> { diff --git a/tests/ui/variance/variance-trait-object-bound.rs b/tests/ui/variance/variance-trait-object-bound.rs index ec3c973bc76..11303c46520 100644 --- a/tests/ui/variance/variance-trait-object-bound.rs +++ b/tests/ui/variance/variance-trait-object-bound.rs @@ -11,7 +11,7 @@ use std::mem; trait T { fn foo(&self); } #[rustc_variance] -struct TOption<'a> { //~ ERROR [-] +struct TOption<'a> { //~ ERROR [+] v: Option<Box<dyn T + 'a>>, } diff --git a/tests/ui/variance/variance-trait-object-bound.stderr b/tests/ui/variance/variance-trait-object-bound.stderr index 7c46b553f43..bfcc8d4a1d1 100644 --- a/tests/ui/variance/variance-trait-object-bound.stderr +++ b/tests/ui/variance/variance-trait-object-bound.stderr @@ -1,4 +1,4 @@ -error: [-] +error: [+] --> $DIR/variance-trait-object-bound.rs:14:1 | LL | struct TOption<'a> { diff --git a/tests/ui/variance/variance-types.rs b/tests/ui/variance/variance-types.rs index b9b6d9c9bb5..cfc03b75473 100644 --- a/tests/ui/variance/variance-types.rs +++ b/tests/ui/variance/variance-types.rs @@ -7,7 +7,7 @@ use std::cell::Cell; // not considered bivariant. #[rustc_variance] -struct InvariantMut<'a,A:'a,B:'a> { //~ ERROR [-, o, o] +struct InvariantMut<'a,A:'a,B:'a> { //~ ERROR [+, o, o] t: &'a mut (A,B) } diff --git a/tests/ui/variance/variance-types.stderr b/tests/ui/variance/variance-types.stderr index 9f7f1d9b0e3..0fda4b8036e 100644 --- a/tests/ui/variance/variance-types.stderr +++ b/tests/ui/variance/variance-types.stderr @@ -1,4 +1,4 @@ -error: [-, o, o] +error: [+, o, o] --> $DIR/variance-types.rs:10:1 | LL | struct InvariantMut<'a,A:'a,B:'a> { |