diff options
Diffstat (limited to 'lisp/emacs-lisp/radix-tree.el')
| -rw-r--r-- | lisp/emacs-lisp/radix-tree.el | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lisp/emacs-lisp/radix-tree.el b/lisp/emacs-lisp/radix-tree.el index 6a483a6d498..0905ac608bb 100644 --- a/lisp/emacs-lisp/radix-tree.el +++ b/lisp/emacs-lisp/radix-tree.el @@ -198,9 +198,10 @@ If not found, return nil." (pcase-defmacro radix-tree-leaf (vpat) "Pattern which matches a radix-tree leaf. The pattern VPAT is matched against the leaf's carried value." - ;; FIXME: We'd like to use a negative pattern (not consp), but pcase - ;; doesn't support it. Using `atom' works but generates sub-optimal code. - `(or `(t . ,,vpat) (and (pred atom) ,vpat)))) + ;; We used to use `(pred atom)', but `pcase' doesn't understand that + ;; `atom' is equivalent to the negation of `consp' and hence generates + ;; suboptimal code. + `(or `(t . ,,vpat) (and (pred (not consp)) ,vpat)))) (defun radix-tree-iter-subtrees (tree fun) "Apply FUN to every immediate subtree of radix TREE. |