[racket] odd background expansion warning

This is a bug in DrRacket's online expansion. It is harmless (except for
the annoyance) and has been fixed in the git version.

Sorry,
Robby



On Thu, Aug 29, 2013 at 12:07 AM, Prabhakar Ragde <plragde at uwaterloo.ca>wrote:

> Just downloaded Racket 5.3.6.
>
> When I open a new DrRacket tab and type the following:
>
> #lang racket
>
> (require (for-label racket))
>
> I get the following warning in large red letters at the bottom of the
> window where the background expansion messages are shown:
>
> +: contract violation expected: number? given: #f argument position: 1st
> other arguments...: 0
>
> It doesn't seem to have any other effect (my programs that had that
> require line in them still work fine) but it's annoying and persistent.
> Any ideas on what's causing it and how to get rid of it? Thanks. --PR
>
> PS I started DrRacket from the command line, and this keeps showing up in
> the terminal window:
>
>   (handle-phaseless-spec . #(struct:srcloc #<path:/Applications/Racket
> v5.3.6/collects/drracket/**private/syncheck/traversals.**rkt> 379 17
> 21528 900))
>   (for-loop . #(struct:srcloc #<path:/Applications/Racket
> v5.3.6/collects/drracket/**private/syncheck/traversals.**rkt> 363 24
> 20541 125))
>   (for-loop . #(struct:srcloc #<path:/Applications/Racket
> v5.3.6/collects/drracket/**private/syncheck/traversals.**rkt> 393 17
> 22464 115))
>   (for-loop . #(struct:srcloc #<path:/Applications/Racket
> v5.3.6/collects/drracket/**private/syncheck/traversals.**rkt> 340 17
> 19252 116))
>   (#f . #(struct:srcloc #<path:/Applications/Racket
> v5.3.6/collects/drracket/**private/expanding-place.rkt> 97 7 3546 4509))
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