bug#66117: 30.0.50; `find-buffer-visiting' is slow when opening large number of buffers

[Gerd Möllmann]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> (And, BTW, the doc string of let says it's a generalized variable?
> Is that right?)

To answer my own question: it is indeed

  (defvar x '(1 . 2))
  (setf (let ((a x)) (cdr a)) 4)
  x
  => (1 . 4)