X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=AST.dcl;h=4f65b0eed3f0868fe52326df8ad8ee2c23b594d8;hb=1f01e39fb2383aa2c63234d0750c0459fe3de752;hp=e9c694486eb02e9eddcfaf2c0c08445c95b1996b;hpb=43f59bf00c11cfbeee906b16063abfca6f4c09cc;p=cc1516.git

diff --git a/AST.dcl b/AST.dcl
index e9c6944..4f65b0e 100644
--- a/AST.dcl
+++ b/AST.dcl
@@ -1,15 +1,16 @@
 definition module AST
 
 from Data.Maybe import :: Maybe
-from StdOverloaded import class toString, class ==, class <
+from StdOverloaded import class toString, class ==, class zero, class <
 
 :: Pos = {line :: Int, col :: Int}
 :: AST = AST [FunDecl]
 :: VarDecl = VarDecl Pos (Maybe Type) String Expr
+:: TVar :== String
 :: Type 
 	= TupleType (Type, Type)
 	| ListType Type
-	| IdType String 
+	| IdType TVar 
 	| IntType 
 	| BoolType
 	| CharType
@@ -41,7 +42,10 @@ from StdOverloaded import class toString, class ==, class <
 instance toString Pos
 instance toString Type
 instance toString AST
+
+instance zero Pos
 instance == Op1
 instance == Op2
 instance < Op1
 instance < Op2
+instance == Type