[racket] weird build failed after changing one character in docs that shouldn't affect anything

Not sure if this is related (I could be my fault this time), but I got another build failed:
$ /usr/racket/bin/raco test -x .
raco test: (submod "./alist.rkt" test)
raco test: (submod "./conditionals.rkt" test)
SIGSEGV MAPERR si_code 1 fault on addr 0x10040
conditionals.rkt: test: non-zero exit: 134
raco test: (submod "./dict.rkt" test)
raco test: (submod "./egal.rkt" test)
raco test: (submod "./lambda-reader.rkt" test)
raco test: (submod "./str.rkt" test)
raco test: (submod "./test.rkt" test)
raco test: (submod "./threading.rkt" test)
raco test: (submod "./utils.rkt" test)
1/9 test failures
The command "/usr/racket/bin/raco test -x ." exited with 1.
Done. Your build exited with 1.
What I did was change the docs so that I could show a #fn anonymous function literal within a @racket[] form and changed the #fn examples to use that.  I don’t see how that could affect the conditionals tests, so I thought I’d post this.  
https://travis-ci.org/greghendershott/rackjure/jobs/29779055#L84
https://github.com/greghendershott/rackjure/pull/42
https://github.com/AlexKnauth/rackjure/commit/7602d631112e15d33bab3356f34818f0afec6682

On Jul 11, 2014, at 8:49 PM, Greg Hendershott <greghendershott at gmail.com> wrote:

> Before noticing this email, I noticed that the build had failed on
> Racket HEAD with a segfault. Builds for all other Racket versions were
> OK.
> 
> I figured it was some temporary weirdness on HEAD, and without
> thinking much, I restarted the build on Travis.
> 
> This time it succeeded fine, even on HEAD.
> 
> 
> If I'd noticed this email first, I would have copied the exact
> segfault message. Unfortunately now I can't find it on Travis.
> Although Travis keeps a build history, that doesn't seem to include
> errored builds that you manually restart.
> 
> 
> On Fri, Jul 11, 2014 at 7:15 PM, Alexander D. Knauth
> <alexander at knauth.org> wrote:
>> I was trying to make docs for ~>% and ~>_ in my fork of rackjure, and the travis cl builds were passing,
>> but then I changed one character in the documentation to fix a typo and then all of a sudden the build failed.
>> All I did was change one % to an _ within a @racketblock so this:
>> @racketblock[
>> (~>% #”foobar” bytes-length (number->string _ 16) string->bytes/utf-8)
>> ]}
>> to this:
>> @racketblock[
>> (~>_ #”foobar” bytes-length (number->string _ 16) string->bytes/utf-8)
>> ]}
>> And then all of a sudden the build failed.
>> Is there anything scribble or anything else does that would make this not work?
>> 
>> https://github.com/greghendershott/rackjure/pull/42
>> https://github.com/AlexKnauth/rackjure/commit/39473e967a186d9a1d53aede461ba95d5bef16ac
>> 
>> 
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