[Haskell-cafe] parsec get line number of lexems

hello, I am experimenting with parsec. I am building a very simple language. I have a (almost) wholy funcrionning language : syntactic check, AST building and byte code génération. Now i want to improve error checking (type checking more precisely). this should be done on the AST basis. but in the ast i lose the line number information for precise error message. so my question is : is ther a way to get the line numbers at parsers level ? i would then store it in the ast for semantic check purpose thanks for your answers Olivier