Re: [Haskell-cafe] attoparsec and backtracking

@Evan Thanks for that link, I posted a somewhat longer argument in there. Personally, I'd love <||>. On Sun 17 Mar 2013 02:02:44 GMT, Evan Laforge wrote:

On Fri, Mar 15, 2013 at 8:49 PM, Niklas Hambüchen wrote:

...

Is it not possible to add an alternative (no pun intended) to <|> that supports the semantics Evan wants?

I assume it's the performance thing. Presumably it would need to pass an extra flag with to the failure continuation to tell it to not retry, though that doesn't sound so bad. Actually, Bryan's response here:

https://github.com/bos/attoparsec/issues/42

makes it sound like he's not opposed to <||> on performance grounds, just that <|> is more intuitive. I agree in general, but not in the case of error msgs! So maybe I just need to see if I can make a patch to add <||>, sounds like Johan at least would be into that.