bug#40727: 27.0.91; 'cl-loop ... across ... and' seems broken

[Noam Postavsky]

Noam Postavsky <npostavs@gmail.com> writes:

> By the way, while adding the test case I found an additional regression
> involving loop termination by a 'var = ...' clause.  I'll open another
> bug about it soon.

Actually, it's very closely connected (only observable after fixing the
original bug, since otherwise the necessary conditions trigger the
--cl-vec-- is void error), so I'll keep it here.  When there is a
(cl-loop for VAR across ARRAY and VAR2 = ...) the array index would get
incremented twice per loop.  Fixed by the patch below (applies on top of
the patch in my previous message).

0002-Don-t-increment-array-index-in-cl-loop-twice-Bug-407.patch
Description: patch

Eli, is it okay to push both of these to emacs-27?  Alternatively,
reverting both fixes to Bug#29799 in addition to the Bug#29866 fix
works:

0001-Revert-Refix-conditional-step-clauses-in-cl-loop.patch
Description: patch

0002-Revert-cl-loop-Add-missing-guard-condition.patch
Description: patch

0003-Revert-cl-loop-Calculate-the-array-length-just-once.patch
Description: patch

0004-Mark-Bug-29799-tests-as-failing-since-we-reverted-th.patch
Description: patch