Add new macro `ignore-error'

* doc/lispref/control.texi (Handling Errors): Document
`ignore-error'.
* lisp/subr.el (ignore-error): New macro.

* lisp/progmodes/elisp-mode.el (elisp-completion-at-point):
Provide completion for `ignore-error'.

1 files changed, 10 insertions, 0 deletions

diff --git a/test/lisp/subr-tests.el b/test/lisp/subr-tests.el
index 06db8f5c902..0023680738d 100644
--- a/test/lisp/subr-tests.el
+++ b/test/lisp/subr-tests.el
@@ -400,5 +400,15 @@ See https://debbugs.gnu.org/cgi/bugreport.cgi?bug=19350."
   (should (equal subr-tests--hook '(f5 f10 f9 f6 f2 f1 f4 f3 f7 f8)))
   )
 
+(ert-deftest ignore-error-tests ()
+  (should (equal (ignore-error (end-of-file)
+                   (read ""))
+                 nil))
+  (should (equal (ignore-error end-of-file
+                   (read ""))
+                 nil))
+  (should-error (ignore-error foo
+                  (read ""))))
+
 (provide 'subr-tests)
 ;;; subr-tests.el ends here