X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=AST.dcl;h=f415045667666543e436a1d621a471cbe7718ede;hb=5573b4ce8215a277a82146a8dae4c4e7ef205bd8;hp=bf6f54fed0e2359521c0acb80bb833fc6655860c;hpb=e34b5f088ff9a86da61afbbe91c2c88f895673c7;p=cc1516.git

diff --git a/AST.dcl b/AST.dcl
index bf6f54f..f415045 100644
--- a/AST.dcl
+++ b/AST.dcl
@@ -1,7 +1,7 @@
 definition module AST
 
 from Data.Maybe import :: Maybe
-from StdOverloaded import class toString, class ==
+from StdOverloaded import class toString, class ==, class zero, class <
 
 :: Pos = {line :: Int, col :: Int}
 :: AST = AST [FunDecl]
@@ -38,9 +38,12 @@ from StdOverloaded import class toString, class ==
 	| FunStmt String [Expr]
 	| ReturnStmt (Maybe Expr)
 
-instance toString AST
-instance toString Type
 instance toString Pos
-instance toString Op2
+instance toString Type
+instance toString AST
+
+instance zero Pos
+instance == Op1
 instance == Op2
-instance toString FieldSelector
+instance < Op1
+instance < Op2