bug#13813: 24.3.50; eval-and-compile in macro inhibits let-binding of variable

[David Engster <deng@randomsample.de>]

Recipe:

* Create a file test.el with the following contents:

(defvar myflag nil)

(defmacro mytestmacro ()
  "An eval-and-compile test."
  `(eval-and-compile (mytestfun)))

(defun mytestfun ()
  (when myflag
    (message "foo")))

(let ((myflag t))
  ;; Should display "foo"
  (mytestmacro))

* Now call with Emacs from trunk:

  emacs --batch -l test.el

* "foo" should be displayed, but isn't. The Emacs 24.2.93 pretest
  however works as expected.

* Note the following:

  - It works if you just 'setq' the 'myflag' variable

  - If you load the file interactively and call `eval-buffer', it will
    also output nothing. However, if you manually evaluate the last
    expression through C-x C-e, it will work.

  - The same problem occurs with `eval-when-compile', but everything
    works with `progn'.


Best,
David "who will never grasp eval-and-compile"

And yes, Stefan, this bug turned up in the EIEIO test suite. :-)