[PATCH] Fix for qt-light (rest operation inside closure would fail)

[Peter Bex]

Hi all,

As found by Kon Lovett, there was still a bug in the rest argument
handling when the rest argument was moved inside a closure and the
rest argument would no longer be accessible locally but needs to be
converted to a closure reference.

I have been unable to come up with a truly minimal testcase so far.
The bug initially got triggered by the qt-light egg.  I managed to
whittle it down to the match-lambda* in qt:gl, but converting it to
manual list-ref calls on a lambda with a rest argument did not succeed
in triggering this bug.

The smaller self-contained test case that triggers the bug is at:

https://paste.call-cc.org/paste?id=5d9bbafd8fee588e06c06b91b909f3f811e64257

I want to take some more time to figure out if I can come up with a small
testcase, but I did not want to wait with sharing the fix.  I don't know
when I'll have time to dig into this again.

Cheers,
Peter

0001-Fix-restoration-of-rest-operations-inside-closures.patch
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