Hi Vitaliy,
I believe this should be fixed now, but the fix was not in 6.9, hence
the error you're seeing.
If you want to try it, you can get a nightly build at
pre.racket-lang.org
6.10 is due in July, and will include the fix.
Thanks for the report, and please do let us know if the problem persists
on the nightly build.
Vincent
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