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diff --git a/sem.dcl b/sem.dcl
index be207dd..dbf1014 100644
--- a/sem.dcl
+++ b/sem.dcl
@@ -1,10 +1,20 @@
 definition module sem
 
+import qualified Data.Map as Map
 from Data.Either import :: Either
-from AST import :: AST
-from lex import :: Error
-from parse import :: ParserOutput
+from AST import :: AST, :: Pos, :: Type, :: FieldSelector, :: Op2
+from StdOverloaded import class toString
 
-:: SemOutput :== Either Error AST
+:: SemError 
+	= ParseError Pos String 
+	| UnifyError Pos Type Type 
+    | FieldSelectorError Pos Type FieldSelector 
+	| OperatorError Pos Op2 Type
+	| Error String
+:: Gamma
+:: SemOutput :== Either [SemError] (AST, Gamma)
 
-sem :: ParserOutput -> SemOutput
+instance toString SemError
+instance toString Gamma
+
+sem :: AST -> SemOutput