When both branches of a||| combinator produce aFailure as a result, the resulting error message is the one coming from the branch that matched the longest chain. This can lead to confusing error messages in situations like this one:

lazyvalparser= (intKeyword~ ...)||| (doubleKeyword~ ...)

where the parser outputs an error message likeexpected 'int'. I think that it would be much less confusing to issue an error message that contains all the possible tokens:expected 'int' or 'double'.

Am I using the API the wrong way, or is there no way of configuring the parser to output such error messages? In the latter case, the addition of such a feature would be much appreciated.