X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibrustc%2Finfer%2Fanon_types%2Fmod.rs;h=96c64c05ccfbd9418868d5d1e8dbdf9d54a9976f;hb=6f637da50c56a22f745fd056691da8c86824cd9b;hp=ae4d88704a098e830c10bc3faafd19b5c1095f5d;hpb=bd455ef165f110143b97106b4e7cd8c83cd21f03;p=rust.git

diff --git a/src/librustc/infer/anon_types/mod.rs b/src/librustc/infer/anon_types/mod.rs
index ae4d88704a0..96c64c05ccf 100644
--- a/src/librustc/infer/anon_types/mod.rs
+++ b/src/librustc/infer/anon_types/mod.rs
@@ -592,7 +592,7 @@ fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
 
     fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
         match ty.sty {
-            ty::TyClosure(def_id, substs) => {
+            ty::Closure(def_id, substs) => {
                 // I am a horrible monster and I pray for death. When
                 // we encounter a closure here, it is always a closure
                 // from within the function that we are currently
@@ -655,7 +655,7 @@ fn instantiate_anon_types_in_map<T: TypeFoldable<'tcx>>(&mut self, value: &T) ->
             tcx,
             reg_op: |reg| reg,
             fldop: |ty| {
-                if let ty::TyAnon(def_id, substs) = ty.sty {
+                if let ty::Anon(def_id, substs) = ty.sty {
                     // Check that this is `impl Trait` type is
                     // declared by `parent_def_id` -- i.e., one whose
                     // value we are inferring.  At present, this is
@@ -679,7 +679,7 @@ fn instantiate_anon_types_in_map<T: TypeFoldable<'tcx>>(&mut self, value: &T) ->
                     // ```
                     //
                     // Here, the return type of `foo` references a
-                    // `TyAnon` indeed, but not one whose value is
+                    // `Anon` indeed, but not one whose value is
                     // presently being inferred. You can get into a
                     // similar situation with closure return types
                     // today:
@@ -691,25 +691,41 @@ fn instantiate_anon_types_in_map<T: TypeFoldable<'tcx>>(&mut self, value: &T) ->
                     // }
                     // ```
                     if let Some(anon_node_id) = tcx.hir.as_local_node_id(def_id) {
-                        let in_definition_scope = match tcx.hir.expect_item(anon_node_id).node {
-                            // impl trait
-                            hir::ItemKind::Existential(hir::ExistTy {
-                                impl_trait_fn: Some(parent),
-                                ..
-                            }) => parent == self.parent_def_id,
-                            // named existential types
-                            hir::ItemKind::Existential(hir::ExistTy {
-                                impl_trait_fn: None,
-                                ..
-                            }) => may_define_existential_type(
-                                tcx,
-                                self.parent_def_id,
-                                anon_node_id,
-                            ),
-                            _ => {
-                                let anon_parent_node_id = tcx.hir.get_parent(anon_node_id);
-                                self.parent_def_id == tcx.hir.local_def_id(anon_parent_node_id)
+                        let parent_def_id = self.parent_def_id;
+                        let def_scope_default = || {
+                            let anon_parent_node_id = tcx.hir.get_parent(anon_node_id);
+                            parent_def_id == tcx.hir.local_def_id(anon_parent_node_id)
+                        };
+                        let in_definition_scope = match tcx.hir.find(anon_node_id) {
+                            Some(hir::map::NodeItem(item)) => match item.node {
+                                // impl trait
+                                hir::ItemKind::Existential(hir::ExistTy {
+                                    impl_trait_fn: Some(parent),
+                                    ..
+                                }) => parent == self.parent_def_id,
+                                // named existential types
+                                hir::ItemKind::Existential(hir::ExistTy {
+                                    impl_trait_fn: None,
+                                    ..
+                                }) => may_define_existential_type(
+                                    tcx,
+                                    self.parent_def_id,
+                                    anon_node_id,
+                                ),
+                                _ => def_scope_default(),
                             },
+                            Some(hir::map::NodeImplItem(item)) => match item.node {
+                                hir::ImplItemKind::Existential(_) => may_define_existential_type(
+                                    tcx,
+                                    self.parent_def_id,
+                                    anon_node_id,
+                                ),
+                                _ => def_scope_default(),
+                            },
+                            _ => bug!(
+                                "expected (impl) item, found {}",
+                                tcx.hir.node_to_string(anon_node_id),
+                            ),
                         };
                         if in_definition_scope {
                             return self.fold_anon_ty(ty, def_id, substs);
@@ -739,11 +755,11 @@ fn fold_anon_ty(
         let tcx = infcx.tcx;
 
         debug!(
-            "instantiate_anon_types: TyAnon(def_id={:?}, substs={:?})",
+            "instantiate_anon_types: Anon(def_id={:?}, substs={:?})",
             def_id, substs
         );
 
-        // Use the same type variable if the exact same TyAnon appears more
+        // Use the same type variable if the exact same Anon appears more
         // than once in the return type (e.g. if it's passed to a type alias).
         if let Some(anon_defn) = self.anon_types.get(&def_id) {
             return anon_defn.concrete_ty;
@@ -789,7 +805,7 @@ fn fold_anon_ty(
 
         for predicate in bounds.predicates {
             // Change the predicate to refer to the type variable,
-            // which will be the concrete type, instead of the TyAnon.
+            // which will be the concrete type, instead of the Anon.
             // This also instantiates nested `impl Trait`.
             let predicate = self.instantiate_anon_types_in_map(&predicate);