At Fri, 31 Aug 2012 09:55:04 -0700, John Clements wrote: > #lang racket > > (sequence->list (in-directory "/tmp/f")) > > … produces this pair of errors: > > . . plt/collects/racket/private/for.rkt:1857:28: directory-list: could not > open directory > path: /tmp/f/sekrit > system error: Permission denied; errno=13 > . . car: contract violation > expected: pair? > given: #<void> > > The first one looks reasonable, but why wouldn't that error just abort the > whole computation? It looks like there's a handler somewhere that eats this > error but then tries to continue by passing #<void> rather than a list. > > The docs don't seem to have anything to say about this. > > Is this a bug?
Yes. The implementation of `in-directory' uses a prompt with the default continuation prompt tag. It should use its own tag, instead, to avoid interfering with error escapes. I'll push a repair. _________________________ Racket Developers list: http://lists.racket-lang.org/dev
