Add some support for using a map like a set.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/comp/middle/ast_map.rs b/src/comp/middle/ast_map.rs
index aa71242f9c8..78f99f75f18 100644
--- a/src/comp/middle/ast_map.rs
+++ b/src/comp/middle/ast_map.rs
@@ -105,6 +105,11 @@ fn new_smallintmap_adapter[K, V](fn(&K) -> uint key_idx,
                 idx += 1u;
             }
         }
+        iter keys() -> K {
+            for each (@tup(K, V) p in self.items()) {
+                put p._0;
+            }
+        }
     }
 
     auto map = smallintmap::mk[V]();