rustc: Handle struct patterns where the expected type is an enum

Previously, rustc would ICE if you matched on an enum-typed thing
with a structure pattern. Error out correctly.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 47ef7227842..10350413f2d 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -41,12 +41,12 @@ pub fn stmt_id(s: &stmt) -> node_id {
     }
 }
 
-pub fn variant_def_ids(d: def) -> (def_id, def_id) {
+pub fn variant_def_ids(d: def) -> Option<(def_id, def_id)> {
     match d {
       def_variant(enum_id, var_id) => {
-        return (enum_id, var_id);
+          Some((enum_id, var_id))
       }
-      _ => fail!(~"non-variant in variant_def_ids")
+      _ => None
     }
 }