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-rw-r--r--src/librustc_metadata/decoder.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/librustc_metadata/decoder.rs b/src/librustc_metadata/decoder.rs
index 59a33fcbbcd..8aa9d3cf9ca 100644
--- a/src/librustc_metadata/decoder.rs
+++ b/src/librustc_metadata/decoder.rs
@@ -699,6 +699,8 @@ impl<'a, 'tcx> CrateMetadata {
                             }
                         }
                         Def::Variant(def_id) => {
+                            // Braced variants, unlike structs, generate unusable names in
+                            // value namespace, they are reserved for possible future use.
                             let vkind = self.get_variant_kind(child_index).unwrap();
                             let ctor_def = Def::VariantCtor(def_id, vkind.ctor_kind());
                             callback(def::Export { def: ctor_def, name: name });