create def ids for impl traits during ast lowering

compiler/rustc_ast_lowering/src/lib.rs

@@ -61,8 +61,8 @@ use rustc_hir::def_id::{LocalDefId, CRATE_DEF_ID};
 use rustc_hir::definitions::DefPathData;
 use rustc_hir::{ConstArg, GenericArg, ItemLocalId, ParamName, TraitCandidate};
 use rustc_index::vec::{Idx, IndexVec};
-use rustc_middle::span_bug;
 use rustc_middle::ty::{ResolverAstLowering, TyCtxt};
+use rustc_middle::{bug, span_bug};
 use rustc_session::parse::feature_err;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::source_map::DesugaringKind;
@@ -1060,13 +1060,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                     // Desugar `AssocTy: Bounds` into `AssocTy = impl Bounds`. We do this by
                     // constructing the HIR for `impl bounds...` and then lowering that.
 
-                    let parent_def_id = self.current_hir_id_owner;
                     let impl_trait_node_id = self.next_node_id();
-                    self.create_def(
-                        parent_def_id.def_id,
-                        impl_trait_node_id,
-                        DefPathData::ImplTrait,
-                    );
 
                     self.with_dyn_type_scope(false, |this| {
                         let node_id = this.next_node_id();
@@ -1357,9 +1351,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                         def_node_id,
                         bounds,
                         false,
-                        &ImplTraitContext::TypeAliasesOpaqueTy,
+                        itctx,
                     ),
                     ImplTraitContext::Universal => {
+                        self.create_def(
+                            self.current_hir_id_owner.def_id,
+                            def_node_id,
+                            DefPathData::ImplTrait,
+                        );
                         let span = t.span;
                         let ident = Ident::from_str_and_span(&pprust::ty_to_string(t), span);
                         let (param, bounds, path) =
@@ -1453,7 +1452,17 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         // frequently opened issues show.
         let opaque_ty_span = self.mark_span_with_reason(DesugaringKind::OpaqueTy, span, None);
 
-        let opaque_ty_def_id = self.local_def_id(opaque_ty_node_id);
+        let opaque_ty_def_id = match origin {
+            hir::OpaqueTyOrigin::TyAlias => self.create_def(
+                self.current_hir_id_owner.def_id,
+                opaque_ty_node_id,
+                DefPathData::ImplTrait,
+            ),
+            hir::OpaqueTyOrigin::FnReturn(fn_def_id) => {
+                self.create_def(fn_def_id, opaque_ty_node_id, DefPathData::ImplTrait)
+            }
+            hir::OpaqueTyOrigin::AsyncFn(..) => bug!("unreachable"),
+        };
         debug!(?opaque_ty_def_id);
 
         // Contains the new lifetime definitions created for the TAIT (if any).

compiler/rustc_middle/src/hir/map/mod.rs

@@ -14,7 +14,7 @@ use rustc_index::vec::Idx;
 use rustc_middle::hir::nested_filter;
 use rustc_span::def_id::StableCrateId;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::Span;
+use rustc_span::{Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
 
 #[inline]
@@ -1131,7 +1131,7 @@ pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
                 .filter_map(|(def_id, info)| {
                     let _ = info.as_owner()?;
                     let def_path_hash = definitions.def_path_hash(def_id);
-                    let span = resolutions.source_span[def_id];
+                    let span = resolutions.source_span.get(def_id).unwrap_or(&DUMMY_SP);
                     debug_assert_eq!(span.parent(), None);
                     Some((def_path_hash, span))
                 })

compiler/rustc_query_system/src/ich/hcx.rs

@@ -12,7 +12,7 @@ use rustc_session::cstore::CrateStore;
 use rustc_session::Session;
 use rustc_span::source_map::SourceMap;
 use rustc_span::symbol::Symbol;
-use rustc_span::{BytePos, CachingSourceMapView, SourceFile, Span, SpanData};
+use rustc_span::{BytePos, CachingSourceMapView, SourceFile, Span, SpanData, DUMMY_SP};
 
 /// This is the context state available during incr. comp. hashing. It contains
 /// enough information to transform `DefId`s and `HirId`s into stable `DefPath`s (i.e.,
@@ -185,7 +185,7 @@ impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
 
     #[inline]
     fn def_span(&self, def_id: LocalDefId) -> Span {
-        self.source_span[def_id]
+        *self.source_span.get(def_id).unwrap_or(&DUMMY_SP)
     }
 
     #[inline]

compiler/rustc_resolve/src/def_collector.rs

@@ -285,21 +285,6 @@ impl<'a, 'b> visit::Visitor<'a> for DefCollector<'a, 'b> {
     fn visit_ty(&mut self, ty: &'a Ty) {
         match ty.kind {
             TyKind::MacCall(..) => self.visit_macro_invoc(ty.id),
-            TyKind::ImplTrait(node_id, _) => {
-                let parent_def = match self.impl_trait_context {
-                    ImplTraitContext::Universal(item_def) => self.resolver.create_def(
-                        item_def,
-                        node_id,
-                        DefPathData::ImplTrait,
-                        self.expansion.to_expn_id(),
-                        ty.span,
-                    ),
-                    ImplTraitContext::Existential => {
-                        self.create_def(node_id, DefPathData::ImplTrait, ty.span)
-                    }
-                };
-                self.with_parent(parent_def, |this| visit::walk_ty(this, ty))
-            }
             _ => visit::walk_ty(self, ty),
         }
     }

src/test/ui/generator/print/generator-print-verbose-1.stderr

@@ -9,7 +9,7 @@ note: generator is not `Send` as this value is used across a yield
   --> $DIR/generator-print-verbose-1.rs:35:9
    |
 LL |         let _non_send_gen = make_non_send_generator();
-   |             ------------- has type `Opaque(DefId(0:34 ~ generator_print_verbose_1[749a]::make_non_send_generator::{opaque#0}), [])` which is not `Send`
+   |             ------------- has type `Opaque(DefId(0:44 ~ generator_print_verbose_1[749a]::make_non_send_generator::{opaque#0}), [])` which is not `Send`
 LL |         yield;
    |         ^^^^^ yield occurs here, with `_non_send_gen` maybe used later
 LL |     };
@@ -35,17 +35,17 @@ note: required because it's used within this generator
    |
 LL |     || {
    |     ^^
-note: required because it appears within the type `Opaque(DefId(0:39 ~ generator_print_verbose_1[749a]::make_gen2::{opaque#0}), [std::sync::Arc<std::cell::RefCell<i32>>])`
+note: required because it appears within the type `Opaque(DefId(0:45 ~ generator_print_verbose_1[749a]::make_gen2::{opaque#0}), [std::sync::Arc<std::cell::RefCell<i32>>])`
   --> $DIR/generator-print-verbose-1.rs:41:30
    |
 LL | pub fn make_gen2<T>(t: T) -> impl Generator<Return = T> {
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: required because it appears within the type `Opaque(DefId(0:42 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`
+note: required because it appears within the type `Opaque(DefId(0:46 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`
   --> $DIR/generator-print-verbose-1.rs:47:34
    |
 LL | fn make_non_send_generator2() -> impl Generator<Return = Arc<RefCell<i32>>> {
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: required because it captures the following types: `Opaque(DefId(0:42 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`, `()`
+   = note: required because it captures the following types: `Opaque(DefId(0:46 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`, `()`
 note: required because it's used within this generator
   --> $DIR/generator-print-verbose-1.rs:52:20
    |

src/test/ui/nll/ty-outlives/impl-trait-captures.stderr

@@ -1,14 +1,14 @@
-error[E0700]: hidden type for `Opaque(DefId(0:11 ~ impl_trait_captures[1afc]::foo::{opaque#0}), [ReStatic, T, ReEarlyBound(0, 'a)])` captures lifetime that does not appear in bounds
+error[E0700]: hidden type for `Opaque(DefId(0:13 ~ impl_trait_captures[1afc]::foo::{opaque#0}), [ReStatic, T, ReEarlyBound(0, 'a)])` captures lifetime that does not appear in bounds
   --> $DIR/impl-trait-captures.rs:11:5
    |
 LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> {
-   |                  -- hidden type `&ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_)) T` captures the anonymous lifetime defined here
+   |                  -- hidden type `&ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:12 ~ impl_trait_captures[1afc]::foo::'_), '_)) T` captures the anonymous lifetime defined here
 LL |     x
    |     ^
    |
-help: to declare that the `impl Trait` captures `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_))`, you can add an explicit `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_))` lifetime bound
+help: to declare that the `impl Trait` captures `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:12 ~ impl_trait_captures[1afc]::foo::'_), '_))`, you can add an explicit `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:12 ~ impl_trait_captures[1afc]::foo::'_), '_))` lifetime bound
    |
-LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_)) {
+LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:12 ~ impl_trait_captures[1afc]::foo::'_), '_)) {
    |                                      ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 error: aborting due to previous error