id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,planetversion,pltversion
500,"Request for adding parser combinator ""zero""",anonymous,bzlib,"The library would benefit from having a parser combinator that succeeds if the parser given as a parameter fails. As far as I can tell, the implementation would be:

(define (zero parser)
    (lambda (in) 
        (let-values
            (((v in) ((literal parser) in))) 
            ((if (failed? v) (return '()) fail) in))))",enhancement,new,major,,bzlib/parseq.plt,,,,(1 3),