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From: Richard Stallman <rms@gnu.org>
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Subject: Re: M-<function-key> vs. ESC <function-key>
Date: Mon, 03 Jan 2005 22:36:27 -0500
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    There doesn't seem to be a translation between M-<function-key> and ESC
    <function-key> for the purpose of keymap lookup.

That is true, but I don't think it is a problem.

The equivalence of ESC and M- for characters is rather a kludge,
and perhaps some day we should reimplement that by implementing ESC
in some other way as an abbreviation for Meta-.