-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
:: Pos = {line :: Int, col :: Int}
:: AST = AST [FunDecl]
:: VarDecl = VarDecl Pos (Maybe Type) String Expr