X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=sem.dcl;h=a5705977b29780197eb20ccbb152a641a1422df9;hb=c5fb28639ae923d9b55f5832e45186911e610991;hp=08d8c8df66288f55ef1e5712823b8a8137e95d85;hpb=13a108705dbabbc75711ce9b3b29fe508262919f;p=cc1516.git

diff --git a/sem.dcl b/sem.dcl
index 08d8c8d..a570597 100644
--- a/sem.dcl
+++ b/sem.dcl
@@ -8,8 +8,9 @@ from StdOverloaded import class toString
 :: SemError 
 :: Gamma
 :: SemOutput :== Either [SemError] (AST, Gamma)
+:: Constraints :== [(Type, Type)]
 
 instance toString SemError
 instance toString Gamma
 
-sem :: AST -> SemOutput
+sem :: AST -> Either [SemError] (AST, Gamma)