definition module parse
+from Data.Either import :: Either
+from Data.Maybe import :: Maybe
+from StdString import class toString
+
import lex
+from AST import :: AST
-:: ParserOutput :== Either String AST
-:: AST = If | While //stub
+:: ParserOutput :== Either Error AST
-parse :: LexerOutput -> ParserOutput
+parser :: LexerOutput -> ParserOutput