Re: C-M-a

[Richard Stallman]

    Whereas C-M-e works fine and sends info via C-h k,
    C-M-a seems dead, just sends nothing, no reaction at all, no
    keyboard event, even not with C-h k followed by C-M-a.

It does not fail for me, so you need to tell us how to reproduce this.
Please read the Bugs section in the Emacs manual, which provides
guidelines on how to write a bug report to give us the
necessary information so we can fix the bug.