\\[universal-argument] not working?

[Robert Pluim]

>>>>> On Tue, 21 Jun 2022 13:19:59 +0300, Eli Zaretskii <eliz@gnu.org> said:

    Eli> You mean, the problem is to say "C-u C-y" instead?

Apropos, something appears to have broken command substitution for
universal-argument:

C-h k C-y

    Reinsert ("paste") the last stretch of killed text.
    More precisely, reinsert the most recent kill, which is the stretch of
    text most recently killed OR yanked, as returned by `current-kill' (which
    see).  Put point at the end, and set mark at the beginning without
    activating it. With just \[universal-argument] as argument, put point
    at beginning, and mark at end.
    With argument N, reinsert the Nth most recent kill.

(this is after a 'make bootstrap' on master)

Robert
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