Subject: 23.0.94; let + make-local-variable => let value made global

From: Lennart Borgman <[email-masked]>
Date: Thu, 4 Jun 2009 23:14:49 +0200

If you eval these lines

  (defvar w14 "global")
  (defvar w15 "global")
  (let ((w14 "let")
        (w15 "let"))
    (set (make-local-variable 'w14) "local")
    (message "w14 maybe let: in buffer=%S, global=%S" w14 (default-value 'w14))
    (message "w15 maybe let: in buffer=%S, global=%S" w15 (default-value 'w15)))
  (message "w14 top level: in buffer=%S, global=%S" w14 (default-value 'w14))
  (message "w15 top level: in buffer=%S, global=%S" w15 (default-value 'w15))

the output will be

  w14 maybe let: in buffer="local", global="let"
  w15 maybe let: in buffer="let", global="let"
  w14 top level: in buffer="global", global="let"
  w15 top level: in buffer="global", global="global"

All values here except w14 global value on next last line are arguably
correct. The last value of w14 should be "global", not "let".

It looks like perhaps the call to (make-local-variable w14) does not
mark the "global let" value of w14 as let bound (or removes that
mark).

In GNU Emacs 23.0.94.1 (i386-mingw-nt5.1.2600)
 of 2009-05-23
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags
-Ic:/g/include -fno-crossjumping'