Re: [Emacs-diffs] master 1392ec7 2/3: A quicker check for quit

[Stefan Monnier]

>     Set and clear immediate_quit before and after loop instead of
>     executing QUIT each time through the loop.  This is OK for loops
>     that affect only locals.

IIRC we have moved some QUIT checks *into* loops in the past in order to
be able to interrupt inf-loops, such as when you do (memq 4 '#1=(1 . #1#)).

Of course, for circular lists a better solution is to use the
hare&tortoise, e.g. with FOR_EACH_TAIL.


        Stefan