Lower anonymous structs or unions to HIR

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -1084,6 +1084,8 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
                 parent_did,
                 false,
                 data.is_non_exhaustive,
+                // FIXME: unnamed fields in crate metadata is unimplemented yet.
+                false,
             ),
         )
     }
@@ -1126,6 +1128,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
             adt_kind,
             variants.into_iter().map(|(_, variant)| variant).collect(),
             repr,
+            false,
         )
     }