This is a bug in the optimizer. The `bytes-utf-8-length` function is
incorrectly marked as always returning a fixnum. I'll push a repair.
Meanwhile, to work around the bug, use something like this:
(define non-broken-bytes-utf-8-length bytes-utf-8-length)
;; To confuse and work around the optimizer:
(set! non-broken-bytes-utf-8-length non-broken-bytes-utf-8-length)
At Fri, 8 Dec 2017 15:58:32 -0800 (PST), Jonathan Simpson wrote:
> Welcome to DrRacket, version 6.11 [3m].
> Language: racket, with debugging; memory limit: 128 MB.
> > (if (bytes-utf-8-length (bytes 255)) 1 2)
> > (bytes-utf-8-length (bytes 255))
> > (not (bytes-utf-8-length (bytes 255)))
> Can anyone explain this to me? Surely the output of the last line should be
> #t. Is it a bug?
> It happens with both 6.11 and 6.3. I know there must be a rational
> explanation, so please enlighten me!
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