$^M By default, running out of memory is an untrappable, fatal error. However, if suitably built, Perl can use the contents of $^M as an emergency memory pool after die()ing.

This seems a straight forward description. The principle is well known. You've died and want to clean up but you are out of memory and can't allocate space to do what you must. $^M is implemented to address this issue.

Be well,
rir

In reply to Re: Is $^M a leftover April Fool? by rir
in thread Is $^M a leftover April Fool? by BrowserUk

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