(defun byte-compile-disable-warning (warning)
"Change `byte-compile-warnings' to disable WARNING.
If `byte-compile-warnings' is t, set it to `(not WARNING)'.
-Otherwise, if the first element is `not', add WARNING, else remove it."
+Otherwise, if the first element is `not', add WARNING, else remove it.
+Normally you should let-bind `byte-compile-warnings' before calling this,
+else the global value will be modified."
(setq byte-compile-warnings
(cond ((eq byte-compile-warnings t)
(list 'not warning))
(defun byte-compile-enable-warning (warning)
"Change `byte-compile-warnings' to enable WARNING.
If `byte-compile-warnings' is `t', do nothing. Otherwise, if the
-first element is `not', remove WARNING, else add it."
+first element is `not', remove WARNING, else add it.
+Normally you should let-bind `byte-compile-warnings' before calling this,
+else the global value will be modified."
(or (eq byte-compile-warnings t)
(setq byte-compile-warnings
(cond ((eq (car byte-compile-warnings) 'not)