Fix diagnostic for matching/creating x-crate re-exported tuple structs with private fields.

The more helpful diagnostic already existed but wasn't working if the
struct in question was a re-export from a different crate.

1 files changed, 14 insertions, 7 deletions

diff --git a/compiler/rustc_resolve/src/build_reduced_graph.rs b/compiler/rustc_resolve/src/build_reduced_graph.rs
index b5c95cfcb29..e10314a11fc 100644
--- a/compiler/rustc_resolve/src/build_reduced_graph.rs
+++ b/compiler/rustc_resolve/src/build_reduced_graph.rs
@@ -995,7 +995,20 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
         // Record some extra data for better diagnostics.
         let cstore = self.r.cstore();
         match res {
-            Res::Def(DefKind::Struct | DefKind::Union, def_id) => {
+            Res::Def(DefKind::Struct, def_id) => {
+                let field_names = cstore.struct_field_names_untracked(def_id, self.r.session);
+                let ctor = cstore.ctor_def_id_and_kind_untracked(def_id);
+                if let Some((ctor_def_id, ctor_kind)) = ctor {
+                    let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
+                    let ctor_vis = cstore.visibility_untracked(ctor_def_id);
+                    let field_visibilities = cstore.struct_field_visibilities_untracked(def_id);
+                    self.r
+                        .struct_constructors
+                        .insert(def_id, (ctor_res, ctor_vis, field_visibilities));
+                }
+                self.insert_field_names(def_id, field_names);
+            }
+            Res::Def(DefKind::Union, def_id) => {
                 let field_names = cstore.struct_field_names_untracked(def_id, self.r.session);
                 self.insert_field_names(def_id, field_names);
             }
@@ -1007,12 +1020,6 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                     self.r.has_self.insert(def_id);
                 }
             }
-            Res::Def(DefKind::Ctor(CtorOf::Struct, ..), def_id) => {
-                let parent = cstore.def_key(def_id).parent;
-                if let Some(struct_def_id) = parent.map(|index| DefId { index, ..def_id }) {
-                    self.r.struct_constructors.insert(struct_def_id, (res, vis, vec![]));
-                }
-            }
             _ => {}
         }
     }