Rollup of 9 pull requests

compiler/rustc_ast/src/token.rs

@@ -558,9 +558,10 @@ impl Token {
     /// Returns `true` if the token can appear at the start of a const param.
     pub fn can_begin_const_arg(&self) -> bool {
         match self.kind {
-            OpenDelim(Delimiter::Brace) => true,
+            OpenDelim(Delimiter::Brace) | Literal(..) | BinOp(Minus) => true,
+            Ident(name, IdentIsRaw::No) if name.is_bool_lit() => true,
             Interpolated(ref nt) => matches!(&**nt, NtExpr(..) | NtBlock(..) | NtLiteral(..)),
-            _ => self.can_begin_literal_maybe_minus(),
+            _ => false,
         }
     }
 
@@ -620,6 +621,21 @@ impl Token {
         }
     }
 
+    pub fn can_begin_string_literal(&self) -> bool {
+        match self.uninterpolate().kind {
+            Literal(..) => true,
+            Interpolated(ref nt) => match &**nt {
+                NtLiteral(_) => true,
+                NtExpr(e) => match &e.kind {
+                    ast::ExprKind::Lit(_) => true,
+                    _ => false,
+                },
+                _ => false,
+            },
+            _ => false,
+        }
+    }
+
     /// A convenience function for matching on identifiers during parsing.
     /// Turns interpolated identifier (`$i: ident`) or lifetime (`$l: lifetime`) token
     /// into the regular identifier or lifetime token it refers to,

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -1110,7 +1110,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             tcx: TyCtxt<'tcx>,
         }
         impl<'tcx> ty::TypeFolder<TyCtxt<'tcx>> for OpaqueFolder<'tcx> {
-            fn interner(&self) -> TyCtxt<'tcx> {
+            fn cx(&self) -> TyCtxt<'tcx> {
                 self.tcx
             }
             fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -397,7 +397,7 @@ struct RemapLateBound<'a, 'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -790,13 +790,13 @@ impl<'tcx, E> TypeFolder<TyCtxt<'tcx>> for ImplTraitInTraitCollector<'_, 'tcx, E
 where
     E: 'tcx,
 {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.ocx.infcx.tcx
     }
 
     fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
         if let ty::Alias(ty::Projection, proj) = ty.kind()
-            && self.interner().is_impl_trait_in_trait(proj.def_id)
+            && self.cx().is_impl_trait_in_trait(proj.def_id)
         {
             if let Some((ty, _)) = self.types.get(&proj.def_id) {
                 return *ty;
@@ -810,9 +810,9 @@ where
             self.types.insert(proj.def_id, (infer_ty, proj.args));
             // Recurse into bounds
             for (pred, pred_span) in self
-                .interner()
+                .cx()
                 .explicit_item_bounds(proj.def_id)
-                .iter_instantiated_copied(self.interner(), proj.args)
+                .iter_instantiated_copied(self.cx(), proj.args)
             {
                 let pred = pred.fold_with(self);
                 let pred = self.ocx.normalize(
@@ -822,7 +822,7 @@ where
                 );
 
                 self.ocx.register_obligation(traits::Obligation::new(
-                    self.interner(),
+                    self.cx(),
                     ObligationCause::new(
                         self.span,
                         self.body_id,
@@ -853,7 +853,7 @@ struct RemapHiddenTyRegions<'tcx> {
 impl<'tcx> ty::FallibleTypeFolder<TyCtxt<'tcx>> for RemapHiddenTyRegions<'tcx> {
     type Error = ErrorGuaranteed;
 
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -2072,7 +2072,7 @@ struct ReplaceTy<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ReplaceTy<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs

@@ -322,7 +322,7 @@ struct Anonymize<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for Anonymize<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -119,16 +119,7 @@ where
 
     let errors = wfcx.select_all_or_error();
     if !errors.is_empty() {
-        let err = infcx.err_ctxt().report_fulfillment_errors(errors);
-        if tcx.dcx().has_errors().is_some() {
-            return Err(err);
-        } else {
-            // HACK(oli-obk): tests/ui/specialization/min_specialization/specialize_on_type_error.rs
-            // causes an delayed bug during normalization, without reporting an error, so we need
-            // to act as if no error happened, in order to let our callers continue and report an
-            // error later in check_impl_items_against_trait.
-            return Ok(());
-        }
+        return Err(infcx.err_ctxt().report_fulfillment_errors(errors));
     }
 
     debug!(?assumed_wf_types);

compiler/rustc_hir_analysis/src/coherence/orphan.rs

@@ -539,7 +539,7 @@ struct TyVarReplacer<'cx, 'tcx> {
 }
 
 impl<'cx, 'tcx> TypeFolder<TyCtxt<'tcx>> for TyVarReplacer<'cx, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 

compiler/rustc_hir_analysis/src/collect/item_bounds.rs

@@ -203,7 +203,7 @@ struct AssocTyToOpaque<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for AssocTyToOpaque<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_hir_typeck/src/writeback.rs

@@ -793,7 +793,7 @@ impl<'cx, 'tcx> Resolver<'cx, 'tcx> {
     }
 
     fn report_error(&self, p: impl Into<ty::GenericArg<'tcx>>) -> ErrorGuaranteed {
-        if let Some(guar) = self.fcx.dcx().has_errors() {
+        if let Some(guar) = self.fcx.tainted_by_errors() {
             guar
         } else {
             self.fcx
@@ -847,7 +847,7 @@ impl<'cx, 'tcx> Resolver<'cx, 'tcx> {
 }
 
 impl<'cx, 'tcx> TypeFolder<TyCtxt<'tcx>> for Resolver<'cx, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.fcx.tcx
     }
 

compiler/rustc_infer/src/infer/canonical/canonicalizer.rs

@@ -304,7 +304,7 @@ struct Canonicalizer<'cx, 'tcx> {
 }
 
 impl<'cx, 'tcx> TypeFolder<TyCtxt<'tcx>> for Canonicalizer<'cx, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -773,7 +773,7 @@ impl<'cx, 'tcx> Canonicalizer<'cx, 'tcx> {
     ) -> ty::Region<'tcx> {
         let var = self.canonical_var(info, r.into());
         let br = ty::BoundRegion { var, kind: ty::BrAnon };
-        ty::Region::new_bound(self.interner(), self.binder_index, br)
+        ty::Region::new_bound(self.cx(), self.binder_index, br)
     }
 
     /// Given a type variable `ty_var` of the given kind, first check

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -158,7 +158,7 @@ struct ClosureEraser<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ClosureEraser<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_infer/src/infer/freshen.rs

@@ -100,7 +100,7 @@ impl<'a, 'tcx> TypeFreshener<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for TypeFreshener<'a, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 
@@ -117,7 +117,7 @@ impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for TypeFreshener<'a, 'tcx> {
             | ty::RePlaceholder(..)
             | ty::ReStatic
             | ty::ReError(_)
-            | ty::ReErased => self.interner().lifetimes.re_erased,
+            | ty::ReErased => self.cx().lifetimes.re_erased,
         }
     }
 

compiler/rustc_infer/src/infer/mod.rs

@@ -1719,7 +1719,7 @@ struct InferenceLiteralEraser<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for InferenceLiteralEraser<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -1859,7 +1859,7 @@ fn replace_param_and_infer_args_with_placeholder<'tcx>(
     }
 
     impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ReplaceParamAndInferWithPlaceholder<'tcx> {
-        fn interner(&self) -> TyCtxt<'tcx> {
+        fn cx(&self) -> TyCtxt<'tcx> {
             self.tcx
         }
 

compiler/rustc_infer/src/infer/resolve.rs

@@ -24,7 +24,7 @@ impl<'a, 'tcx> OpportunisticVarResolver<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for OpportunisticVarResolver<'a, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 
@@ -66,7 +66,7 @@ impl<'a, 'tcx> OpportunisticRegionResolver<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for OpportunisticRegionResolver<'a, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 
@@ -85,7 +85,7 @@ impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for OpportunisticRegionResolver<'a, 'tcx
                 .inner
                 .borrow_mut()
                 .unwrap_region_constraints()
-                .opportunistic_resolve_var(TypeFolder::interner(self), vid),
+                .opportunistic_resolve_var(TypeFolder::cx(self), vid),
             _ => r,
         }
     }
@@ -121,7 +121,7 @@ struct FullTypeResolver<'a, 'tcx> {
 impl<'a, 'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for FullTypeResolver<'a, 'tcx> {
     type Error = FixupError;
 
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 

compiler/rustc_infer/src/infer/snapshot/fudge.rs

@@ -183,7 +183,7 @@ pub struct InferenceFudger<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for InferenceFudger<'a, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 

compiler/rustc_lint/src/non_local_def.rs

@@ -390,7 +390,7 @@ struct ReplaceLocalTypesWithInfer<'a, 'tcx, F: FnMut(DefId) -> bool> {
 impl<'a, 'tcx, F: FnMut(DefId) -> bool> TypeFolder<TyCtxt<'tcx>>
     for ReplaceLocalTypesWithInfer<'a, 'tcx, F>
 {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 

compiler/rustc_middle/src/traits/solve.rs

@@ -53,7 +53,7 @@ impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ExternalConstraints<'tcx> {
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
-        Ok(FallibleTypeFolder::interner(folder).mk_external_constraints(ExternalConstraintsData {
+        Ok(FallibleTypeFolder::cx(folder).mk_external_constraints(ExternalConstraintsData {
             region_constraints: self.region_constraints.clone().try_fold_with(folder)?,
             opaque_types: self
                 .opaque_types
@@ -68,7 +68,7 @@ impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ExternalConstraints<'tcx> {
     }
 
     fn fold_with<F: TypeFolder<TyCtxt<'tcx>>>(self, folder: &mut F) -> Self {
-        TypeFolder::interner(folder).mk_external_constraints(ExternalConstraintsData {
+        TypeFolder::cx(folder).mk_external_constraints(ExternalConstraintsData {
             region_constraints: self.region_constraints.clone().fold_with(folder),
             opaque_types: self.opaque_types.iter().map(|opaque| opaque.fold_with(folder)).collect(),
             normalization_nested_goals: self.normalization_nested_goals.clone().fold_with(folder),
@@ -94,19 +94,17 @@ impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for PredefinedOpaques<'tcx> {
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
-        Ok(FallibleTypeFolder::interner(folder).mk_predefined_opaques_in_body(
-            PredefinedOpaquesData {
-                opaque_types: self
-                    .opaque_types
-                    .iter()
-                    .map(|opaque| opaque.try_fold_with(folder))
-                    .collect::<Result<_, F::Error>>()?,
-            },
-        ))
+        Ok(FallibleTypeFolder::cx(folder).mk_predefined_opaques_in_body(PredefinedOpaquesData {
+            opaque_types: self
+                .opaque_types
+                .iter()
+                .map(|opaque| opaque.try_fold_with(folder))
+                .collect::<Result<_, F::Error>>()?,
+        }))
     }
 
     fn fold_with<F: TypeFolder<TyCtxt<'tcx>>>(self, folder: &mut F) -> Self {
-        TypeFolder::interner(folder).mk_predefined_opaques_in_body(PredefinedOpaquesData {
+        TypeFolder::cx(folder).mk_predefined_opaques_in_body(PredefinedOpaquesData {
             opaque_types: self.opaque_types.iter().map(|opaque| opaque.fold_with(folder)).collect(),
         })
     }

compiler/rustc_middle/src/ty/abstract_const.rs

@@ -40,7 +40,7 @@ impl<'tcx> TyCtxt<'tcx> {
         }
 
         impl<'tcx> TypeFolder<TyCtxt<'tcx>> for Expander<'tcx> {
-            fn interner(&self) -> TyCtxt<'tcx> {
+            fn cx(&self) -> TyCtxt<'tcx> {
                 self.tcx
             }
             fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {

compiler/rustc_middle/src/ty/diagnostics.rs

@@ -579,7 +579,7 @@ pub struct MakeSuggestableFolder<'tcx> {
 impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for MakeSuggestableFolder<'tcx> {
     type Error = ();
 
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_middle/src/ty/erase_regions.rs

@@ -37,7 +37,7 @@ struct RegionEraserVisitor<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RegionEraserVisitor<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_middle/src/ty/fold.rs

@@ -28,7 +28,7 @@ where
     G: FnMut(ty::Region<'tcx>) -> ty::Region<'tcx>,
     H: FnMut(ty::Const<'tcx>) -> ty::Const<'tcx>,
 {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -99,7 +99,7 @@ impl<'a, 'tcx> RegionFolder<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for RegionFolder<'a, 'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -176,7 +176,7 @@ impl<'tcx, D> TypeFolder<TyCtxt<'tcx>> for BoundVarReplacer<'tcx, D>
 where
     D: BoundVarReplacerDelegate<'tcx>,
 {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }