<div dir="ltr">This is a bug in DrRacket's online expansion. It is harmless (except for the annoyance) and has been fixed in the git version.<div><br></div><div>Sorry,</div><div>Robby</div><div><br></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Thu, Aug 29, 2013 at 12:07 AM, Prabhakar Ragde <span dir="ltr"><<a href="mailto:plragde@uwaterloo.ca" target="_blank">plragde@uwaterloo.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Just downloaded Racket 5.3.6.<br>
<br>
When I open a new DrRacket tab and type the following:<br>
<br>
#lang racket<br>
<br>
(require (for-label racket))<br>
<br>
I get the following warning in large red letters at the bottom of the<br>
window where the background expansion messages are shown:<br>
<br>
+: contract violation expected: number? given: #f argument position: 1st<br>
other arguments...: 0<br>
<br>
It doesn't seem to have any other effect (my programs that had that<br>
require line in them still work fine) but it's annoying and persistent.<br>
Any ideas on what's causing it and how to get rid of it? Thanks. --PR<br>
<br>
PS I started DrRacket from the command line, and this keeps showing up in the terminal window:<br>
<br>
(handle-phaseless-spec . #(struct:srcloc #<path:/Applications/Racket v5.3.6/collects/drracket/<u></u>private/syncheck/traversals.<u></u>rkt> 379 17 21528 900))<br>
(for-loop . #(struct:srcloc #<path:/Applications/Racket v5.3.6/collects/drracket/<u></u>private/syncheck/traversals.<u></u>rkt> 363 24 20541 125))<br>
(for-loop . #(struct:srcloc #<path:/Applications/Racket v5.3.6/collects/drracket/<u></u>private/syncheck/traversals.<u></u>rkt> 393 17 22464 115))<br>
(for-loop . #(struct:srcloc #<path:/Applications/Racket v5.3.6/collects/drracket/<u></u>private/syncheck/traversals.<u></u>rkt> 340 17 19252 116))<br>
(#f . #(struct:srcloc #<path:/Applications/Racket v5.3.6/collects/drracket/<u></u>private/expanding-place.rkt> 97 7 3546 4509))<br>
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</blockquote></div><br></div>