bug#67568: Emacs master: Bug in byte compiler when there's an unused parameter.

[Alan Mackenzie]

Hello, Emacs.

On a recent Emacs master:

(i) emacs -Q
(ii) In *scratch* enter the following:

    (byte-compile (lambda (x) "doc" "foo"))

  .
(iii) Enter C-u C-x C-e to evaluate the form.  The result looks like:

    #[257 "\300\207" [nil] 2 "doc

    (fn X)"]

  .  This is incorrect.  The only form in the constants vector is nil.
  It should be "foo".

(iv) Note that this only happens with the unused parameter x.  Without
it, the form compiles correctly.

-- 
Alan Mackenzie (Nuremberg, Germany).