I've finally been able to track down this bug. It's due to a misapplied
unsafe operation in the Typed Racket optimizer, and that bug is
triggered when compiling "midi-readwrite" --- which is why it's so
consistent for you and not seen by others who don't have the package
installed.
In the TR implementation, changing `unsafe-Req-seq` to use `Rep-seq`
instead of `unsafe-struct*-ref` produces the error
Rep-seq: contract violation
expected: Rep?
given: #f
compilation context...:
..../pkgs/midi-readwrite/midi-readwrite/midi-read.rkt
context...:
..../typed-racket/types/subtype.rkt:238:0: subtype*
....
At Tue, 20 Oct 2015 12:05:00 -0400, "'John Clements' via dev-redirect" wrote:
> Just got a seg fault while running setup, apparently during a call to
> fast_equal_hash_key.
>
> Here’s a gist of the crash report:
>
> https://gist.github.com/jbclements/a8601a360881b5826138
>
> Here’s a gist of the terminal output:
>
> https://gist.github.com/jbclements/b2c262c81ef36ab01377
>
> I’m building commit dfab18fe4729e71f53d0056572e3f85a72467247
>
> (though in principle this could depend on the commit that all of my cloned
> trees are on, too…)
>
> I’m just going to try building again.
>
> John
>
>
>
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