Started with unions.

src/GF/Compile/MkUnion.hs

@@ -0,0 +1,19 @@
+module MkUnion (makeUnion) where
+
+import Grammar
+import Ident
+import Modules
+import Macros
+import PrGrammar
+
+import Operations
+
+import Monad
+
+-- building union of modules
+-- AR 21/8/2002 -- 22/6/2003 for GF with modules
+
+makeUnion :: SourceGrammar -> Ident -> ModuleType Ident -> [(Ident,[Ident])] ->
+             Err SourceModule
+makeUnion gr m ty imps = do
+  Bad "Sorry: unions not yet implemented"