diff options
Diffstat (limited to 'lisp/emacs-lisp')
| -rw-r--r-- | lisp/emacs-lisp/pcase.el | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lisp/emacs-lisp/pcase.el b/lisp/emacs-lisp/pcase.el index 6cfd074cf0b..ce148c9e1a9 100644 --- a/lisp/emacs-lisp/pcase.el +++ b/lisp/emacs-lisp/pcase.el @@ -118,7 +118,9 @@ two element list, binding its elements to symbols named `foo' and A significant difference from `cl-destructuring-bind' is that, if a pattern match fails, the next case is tried until either a -successful match is found or there are no more cases. +successful match is found or there are no more cases. The CODE +expression corresponding to the matching pattern determines the +return value. If there is no match the returned value is nil. Another difference is that pattern elements may be quoted, meaning they must match exactly: The pattern \\='(foo bar) @@ -211,7 +213,8 @@ Emacs Lisp manual for more information and examples." ;;;###autoload (defmacro pcase-exhaustive (exp &rest cases) - "The exhaustive version of `pcase' (which see)." + "The exhaustive version of `pcase' (which see). +If EXP fails to match any of the patterns in CASES, an error is signaled." (declare (indent 1) (debug pcase)) (let* ((x (gensym "x")) (pcase--dontwarn-upats (cons x pcase--dontwarn-upats))) |