diff options
Diffstat (limited to 'lisp/emacs-lisp')
| -rw-r--r-- | lisp/emacs-lisp/byte-opt.el | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lisp/emacs-lisp/byte-opt.el b/lisp/emacs-lisp/byte-opt.el index 0da2a9b882d..a7e1df3622d 100644 --- a/lisp/emacs-lisp/byte-opt.el +++ b/lisp/emacs-lisp/byte-opt.el @@ -1297,8 +1297,11 @@ See Info node `(elisp) Integer Basics'." (if else `(progn ,condition ,@else) condition)) - ;; (if X t) -> (not (not X)) - ((and (eq then t) (null else)) + ;; (if X nil t) -> (not X) + ((and (eq then nil) (eq else '(t))) + `(not ,condition)) + ;; (if X t [nil]) -> (not (not X)) + ((and (eq then t) (or (null else) (eq else '(nil)))) `(not ,(byte-opt--negate condition))) ;; (if VAR VAR X...) -> (or VAR (progn X...)) ((and (symbolp condition) (eq condition then)) |