Re: [Haskell-cafe] Re: Parsec lookahead and <|>

Thanks for your replies. Job Vranish wrote:

Martijn, how did you encounter this problem?

My list of input symbols contains some extra information and I was using lookahead to query for that information before doing the actual parsing. I was using it in various places, including a list of choices separated by <|>. I was assuming it wouldn't affect the choice but it turned out that Parsec was always going for the first one because I used a lookahead (see la) that always succeeds. Martijn.