[add melems to MapLike
John Meacham <john@repetae.net>**20060409064017] hunk ./Util/SetLike.hs 137
+    melems :: m -> [v]
hunk ./Util/SetLike.hs 145
+    melems = IM.elems
hunk ./Util/SetLike.hs 151
+    melems = M.elems