definition module AST
from Data.Maybe import :: Maybe
-from StdOverloaded import class toString
+from StdOverloaded import class toString, class ==
:: Pos = {line :: Int, col :: Int}
:: AST = AST [VarDecl] [FunDecl]
instance toString AST
instance toString Type
instance toString Pos
+instance toString Op2
+instance == Op2
instance toString FieldSelector