Rollup merge of #95560 - lcnr:obligation-cause, r=oli-obk

convert more `DefId`s to `LocalDefId`

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -237,7 +237,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
                 ObligationCauseCode::MatchImpl(parent, ..) => parent.code(),
                 _ => cause.code(),
             }
-            && let (ObligationCauseCode::ItemObligation(item_def_id), None) = (code, override_error_code)
+            && let (&ObligationCauseCode::ItemObligation(item_def_id), None) = (code, override_error_code)
         {
             // Same case of `impl Foo for dyn Bar { fn qux(&self) {} }` introducing a `'static`
             // lifetime as above, but called using a fully-qualified path to the method:
@@ -245,7 +245,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
             let mut v = TraitObjectVisitor(FxHashSet::default());
             v.visit_ty(param.param_ty);
             if let Some((ident, self_ty)) =
-                self.get_impl_ident_and_self_ty_from_trait(*item_def_id, &v.0)
+                self.get_impl_ident_and_self_ty_from_trait(item_def_id, &v.0)
                 && self.suggest_constrain_dyn_trait_in_impl(&mut err, &v.0, ident, self_ty)
             {
                 override_error_code = Some(ident.name);

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/trait_impl_difference.rs

@@ -7,7 +7,7 @@ use crate::traits::ObligationCauseCode::CompareImplMethodObligation;
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::Visitor;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::print::RegionHighlightMode;
@@ -51,7 +51,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
         {
             let guar = self.emit_associated_type_err(
                 span,
-                self.infcx.tcx.item_name(impl_item_def_id),
+                self.infcx.tcx.item_name(impl_item_def_id.to_def_id()),
                 impl_item_def_id,
                 trait_item_def_id,
             );
@@ -155,7 +155,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
         &self,
         span: Span,
         item_name: Symbol,
-        impl_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
         trait_item_def_id: DefId,
     ) -> ErrorGuaranteed {
         let impl_sp = self.tcx().def_span(impl_item_def_id);

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

@@ -348,7 +348,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                 let mut err = self.report_concrete_failure(*parent, sub, sup);
 
                 let trait_item_span = self.tcx.def_span(trait_item_def_id);
-                let item_name = self.tcx.item_name(impl_item_def_id);
+                let item_name = self.tcx.item_name(impl_item_def_id.to_def_id());
                 err.span_label(
                     trait_item_span,
                     format!("definition of `{}` from trait", item_name),
@@ -370,7 +370,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     let where_clause_span = self
                         .tcx
                         .hir()
-                        .get_generics(impl_item_def_id.expect_local())
+                        .get_generics(impl_item_def_id)
                         .unwrap()
                         .where_clause
                         .tail_span_for_suggestion();

compiler/rustc_infer/src/infer/mod.rs

@@ -423,16 +423,20 @@ pub enum SubregionOrigin<'tcx> {
 
     /// Comparing the signature and requirements of an impl method against
     /// the containing trait.
-    CompareImplMethodObligation { span: Span, impl_item_def_id: DefId, trait_item_def_id: DefId },
+    CompareImplMethodObligation {
+        span: Span,
+        impl_item_def_id: LocalDefId,
+        trait_item_def_id: DefId,
+    },
 
     /// Comparing the signature and requirements of an impl associated type
     /// against the containing trait
-    CompareImplTypeObligation { span: Span, impl_item_def_id: DefId, trait_item_def_id: DefId },
+    CompareImplTypeObligation { span: Span, impl_item_def_id: LocalDefId, trait_item_def_id: DefId },
 
     /// Checking that the bounds of a trait's associated type hold for a given impl
     CheckAssociatedTypeBounds {
         parent: Box<SubregionOrigin<'tcx>>,
-        impl_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
         trait_item_def_id: DefId,
     },
 }

compiler/rustc_infer/src/traits/error_reporting/mod.rs

@@ -4,7 +4,7 @@ use crate::infer::InferCtxt;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{struct_span_err, DiagnosticBuilder, ErrorGuaranteed};
 use rustc_hir as hir;
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::ty::TyCtxt;
 use rustc_span::{MultiSpan, Span};
 use std::fmt;
@@ -14,7 +14,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     pub fn report_extra_impl_obligation(
         &self,
         error_span: Span,
-        impl_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
         trait_item_def_id: DefId,
         requirement: &dyn fmt::Display,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
@@ -25,7 +25,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
 
         if let Some(trait_item_span) = self.tcx.hir().span_if_local(trait_item_def_id) {
             let span = self.tcx.sess.source_map().guess_head_span(trait_item_span);
-            let item_name = self.tcx.item_name(impl_item_def_id);
+            let item_name = self.tcx.item_name(impl_item_def_id.to_def_id());
             err.span_label(span, format!("definition of `{}` from trait", item_name));
         }
 

compiler/rustc_middle/src/traits/mod.rs

@@ -276,24 +276,23 @@ pub enum ObligationCauseCode<'tcx> {
 
     /// Error derived when matching traits/impls; see ObligationCause for more details
     CompareImplMethodObligation {
-        impl_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
         trait_item_def_id: DefId,
     },
 
     /// Error derived when matching traits/impls; see ObligationCause for more details
     CompareImplTypeObligation {
-        impl_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
         trait_item_def_id: DefId,
     },
 
     /// Checking that the bounds of a trait's associated type hold for a given impl
     CheckAssociatedTypeBounds {
-        impl_item_def_id: DefId,
+        impl_item_def_id: LocalDefId,
         trait_item_def_id: DefId,
     },
 
-    /// Checking that this expression can be assigned where it needs to be
+    /// Checking that this expression can be assigned to its target.
-    // FIXME(eddyb) #11161 is the original Expr required?
     ExprAssignable,
 
     /// Computing common supertype in the arms of a match expression

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -1913,15 +1913,15 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
                     self.suggest_fully_qualified_path(&mut err, def_id, span, trait_ref.def_id());
                 } else if let (
                     Ok(ref snippet),
-                    ObligationCauseCode::BindingObligation(ref def_id, _),
+                    &ObligationCauseCode::BindingObligation(def_id, _),
                 ) =
                     (self.tcx.sess.source_map().span_to_snippet(span), obligation.cause.code())
                 {
-                    let generics = self.tcx.generics_of(*def_id);
+                    let generics = self.tcx.generics_of(def_id);
                     if generics.params.iter().any(|p| p.name != kw::SelfUpper)
                         && !snippet.ends_with('>')
                         && !generics.has_impl_trait()
-                        && !self.tcx.fn_trait_kind_from_lang_item(*def_id).is_some()
+                        && !self.tcx.fn_trait_kind_from_lang_item(def_id).is_some()
                     {
                         // FIXME: To avoid spurious suggestions in functions where type arguments
                         // where already supplied, we check the snippet to make sure it doesn't
@@ -2223,6 +2223,7 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
             "suggest_unsized_bound_if_applicable: pred={:?} item_def_id={:?} span={:?}",
             pred, item_def_id, span
         );
+
         let (Some(node), true) = (
             self.tcx.hir().get_if_local(item_def_id),
             Some(pred.def_id()) == self.tcx.lang_items().sized_trait(),

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -128,7 +128,7 @@ pub trait InferCtxtExt<'tcx> {
     fn suggest_fully_qualified_path(
         &self,
         err: &mut Diagnostic,
-        def_id: DefId,
+        item_def_id: DefId,
         span: Span,
         trait_ref: DefId,
     );
@@ -1317,16 +1317,16 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
     fn suggest_fully_qualified_path(
         &self,
         err: &mut Diagnostic,
-        def_id: DefId,
+        item_def_id: DefId,
         span: Span,
         trait_ref: DefId,
     ) {
-        if let Some(assoc_item) = self.tcx.opt_associated_item(def_id) {
+        if let Some(assoc_item) = self.tcx.opt_associated_item(item_def_id) {
             if let ty::AssocKind::Const | ty::AssocKind::Type = assoc_item.kind {
                 err.note(&format!(
                     "{}s cannot be accessed directly on a `trait`, they can only be \
                         accessed through a specific `impl`",
-                    assoc_item.kind.as_def_kind().descr(def_id)
+                    assoc_item.kind.as_def_kind().descr(item_def_id)
                 ));
                 err.span_suggestion(
                     span,

compiler/rustc_typeck/src/check/compare_method.rs

@@ -28,7 +28,6 @@ use super::{potentially_plural_count, FnCtxt, Inherited};
 /// - `impl_m_span`: span to use for reporting errors
 /// - `trait_m`: the method in the trait
 /// - `impl_trait_ref`: the TraitRef corresponding to the trait implementation
-
 crate fn compare_impl_method<'tcx>(
     tcx: TyCtxt<'tcx>,
     impl_m: &ty::AssocItem,
@@ -88,7 +87,7 @@ fn compare_predicate_entailment<'tcx>(
         impl_m_span,
         impl_m_hir_id,
         ObligationCauseCode::CompareImplMethodObligation {
-            impl_item_def_id: impl_m.def_id,
+            impl_item_def_id: impl_m.def_id.expect_local(),
             trait_item_def_id: trait_m.def_id,
         },
     );
@@ -231,7 +230,7 @@ fn compare_predicate_entailment<'tcx>(
                 span,
                 impl_m_hir_id,
                 ObligationCauseCode::CompareImplMethodObligation {
-                    impl_item_def_id: impl_m.def_id,
+                    impl_item_def_id: impl_m.def_id.expect_local(),
                     trait_item_def_id: trait_m.def_id,
                 },
             );
@@ -1154,7 +1153,7 @@ fn compare_type_predicate_entailment<'tcx>(
         impl_ty_span,
         impl_ty_hir_id,
         ObligationCauseCode::CompareImplTypeObligation {
-            impl_item_def_id: impl_ty.def_id,
+            impl_item_def_id: impl_ty.def_id.expect_local(),
             trait_item_def_id: trait_ty.def_id,
         },
     );
@@ -1383,7 +1382,7 @@ pub fn check_type_bounds<'tcx>(
             impl_ty_span,
             impl_ty_hir_id,
             ObligationCauseCode::CheckAssociatedTypeBounds {
-                impl_item_def_id: impl_ty.def_id,
+                impl_item_def_id: impl_ty.def_id.expect_local(),
                 trait_item_def_id: trait_ty.def_id,
             },
         );

compiler/rustc_typeck/src/check/method/confirm.rs

@@ -2,9 +2,9 @@ use super::{probe, MethodCallee};
 
 use crate::astconv::{AstConv, CreateSubstsForGenericArgsCtxt, IsMethodCall};
 use crate::check::{callee, FnCtxt};
-use crate::hir::def_id::DefId;
-use crate::hir::GenericArg;
 use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
+use rustc_hir::GenericArg;
 use rustc_infer::infer::{self, InferOk};
 use rustc_middle::traits::{ObligationCauseCode, UnifyReceiverContext};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, PointerCast};

compiler/rustc_typeck/src/check/wfcheck.rs

@@ -940,7 +940,7 @@ fn check_associated_item(
                     item.ident(fcx.tcx).span,
                     sig,
                     hir_sig.decl,
-                    item.def_id,
+                    item.def_id.expect_local(),
                     &mut implied_bounds,
                 );
                 check_method_receiver(fcx, hir_sig, item, self_ty);
@@ -1068,7 +1068,7 @@ fn check_type_defn<'tcx, F>(
             }
         }
 
-        check_where_clauses(fcx, item.span, item.def_id.to_def_id(), None);
+        check_where_clauses(fcx, item.span, item.def_id, None);
 
         // No implied bounds in a struct definition.
         FxHashSet::default()
@@ -1096,7 +1096,7 @@ fn check_trait(tcx: TyCtxt<'_>, item: &hir::Item<'_>) {
 
     // FIXME: this shouldn't use an `FnCtxt` at all.
     for_item(tcx, item).with_fcx(|fcx| {
-        check_where_clauses(fcx, item.span, item.def_id.to_def_id(), None);
+        check_where_clauses(fcx, item.span, item.def_id, None);
 
         FxHashSet::default()
     });
@@ -1144,7 +1144,7 @@ fn check_item_fn(
     for_id(tcx, def_id, span).with_fcx(|fcx| {
         let sig = tcx.fn_sig(def_id);
         let mut implied_bounds = FxHashSet::default();
-        check_fn_or_method(fcx, ident.span, sig, decl, def_id.to_def_id(), &mut implied_bounds);
+        check_fn_or_method(fcx, ident.span, sig, decl, def_id, &mut implied_bounds);
         implied_bounds
     })
 }
@@ -1238,7 +1238,7 @@ fn check_impl<'tcx>(
             }
         }
 
-        check_where_clauses(fcx, item.span, item.def_id.to_def_id(), None);
+        check_where_clauses(fcx, item.span, item.def_id, None);
 
         fcx.impl_implied_bounds(item.def_id.to_def_id(), item.span)
     });
@@ -1249,7 +1249,7 @@ fn check_impl<'tcx>(
 fn check_where_clauses<'tcx, 'fcx>(
     fcx: &FnCtxt<'fcx, 'tcx>,
     span: Span,
-    def_id: DefId,
+    def_id: LocalDefId,
     return_ty: Option<(Ty<'tcx>, Span)>,
 ) {
     let tcx = fcx.tcx;
@@ -1317,7 +1317,7 @@ fn check_where_clauses<'tcx, 'fcx>(
     // For more examples see tests `defaults-well-formedness.rs` and `type-check-defaults.rs`.
     //
     // First we build the defaulted substitution.
-    let substs = InternalSubsts::for_item(tcx, def_id, |param, _| {
+    let substs = InternalSubsts::for_item(tcx, def_id.to_def_id(), |param, _| {
         match param.kind {
             GenericParamDefKind::Lifetime => {
                 // All regions are identity.
@@ -1411,8 +1411,11 @@ fn check_where_clauses<'tcx, 'fcx>(
             // below: there, we are not trying to prove those predicates
             // to be *true* but merely *well-formed*.
             let pred = fcx.normalize_associated_types_in(sp, pred);
-            let cause =
+            let cause = traits::ObligationCause::new(
-                traits::ObligationCause::new(sp, fcx.body_id, traits::ItemObligation(def_id));
+                sp,
+                fcx.body_id,
+                traits::ItemObligation(def_id.to_def_id()),
+            );
             traits::Obligation::new(cause, fcx.param_env, pred)
         });
 
@@ -1445,10 +1448,10 @@ fn check_fn_or_method<'fcx, 'tcx>(
     span: Span,
     sig: ty::PolyFnSig<'tcx>,
     hir_decl: &hir::FnDecl<'_>,
-    def_id: DefId,
+    def_id: LocalDefId,
     implied_bounds: &mut FxHashSet<Ty<'tcx>>,
 ) {
-    let sig = fcx.tcx.liberate_late_bound_regions(def_id, sig);
+    let sig = fcx.tcx.liberate_late_bound_regions(def_id.to_def_id(), sig);
 
     // Normalize the input and output types one at a time, using a different
     // `WellFormedLoc` for each. We cannot call `normalize_associated_types`
@@ -1462,7 +1465,7 @@ fn check_fn_or_method<'fcx, 'tcx>(
                 span,
                 ty,
                 WellFormedLoc::Param {
-                    function: def_id.expect_local(),
+                    function: def_id,
                     // Note that the `param_idx` of the output type is
                     // one greater than the index of the last input type.
                     param_idx: i.try_into().unwrap(),
@@ -1485,7 +1488,7 @@ fn check_fn_or_method<'fcx, 'tcx>(
             input_ty.into(),
             ty.span,
             ObligationCauseCode::WellFormed(Some(WellFormedLoc::Param {
-                function: def_id.expect_local(),
+                function: def_id,
                 param_idx: i.try_into().unwrap(),
             })),
         );