🚀 go-pugleaf

I don't know if this has been mentioned before, but it cropped up for
me recently.

If a Lisp program switches buffers while inside a "let" form that binds
a variable that was buffer-local in the original buffer, the variable
is restored in the wrong buffer:

	(set-buffer "b")
	(setq foo 'b)
	(set-buffer "a")
	(make-local-variable 'foo)
	(setq foo 'a)
	(let ((foo 'temp))
	  foo   => 'temp
	  (set-buffer "b")
	  foo   => 'b   ; This is questionable; I'd prefer to see 'temp still.
	)
	foo  => 'a      ; Wrong!  We see buffer a's local value in buffer b.
	(set-buffer "a")
	foo  => 'temp   ; Wrong!  This temporary value should be gone now.

The solution is to switch back to the original buffer before leaving the
"let".  For maximum safety, use "save-excursion" immediately inside the
"let".

								-- Dave