Parsing union

examples/push_struct.core

@@ -12,6 +12,10 @@ PushStruct :: (a: *MA.Arena, type: Type): *void
 	result := MA.PushSize(a, ti.size->U64)
 	return result
 
+U :: union
+	a: F64
+	b: F32
+
 main :: (argc: int, argv: **char): int
 	arena: MA.Arena
 	a: *int = PushStruct(&arena, int)