The buffer M must continue to exist until after the echo area gets
cleared or some other message gets displayed there. This means do
not pass text that is stored in a Lisp string; do not pass text in
a buffer that was alloca'd. */
I think that comment is probably obsolete. Nowadays the echo area
text is stored in real buffers. Before Emacs 20, I think it was
stored in null-terminated C strings.
You could double-check this by looking at the code from Emacs 19.
If this comment was needed for that reason, it can be deleted now.
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