1 files changed, 10 insertions, 2 deletions

diff --git a/src/eval.c b/src/eval.c
index 8149683a104..e722b53fb72 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1358,8 +1358,12 @@ A handler is applicable to an error
 if CONDITION-NAME is one of the error's condition names.
 If an error happens, the first applicable handler is run.
 
-The car of a handler may be a list of condition names
-instead of a single condition name.  Then it handles all of them.
+The car of a handler may be a list of condition names instead of a
+single condition name; then it handles all of them.  If the special
+condition name `debug' is present in this list, it allows another
+condition in the list to run the debugger if `debug-on-error' and the
+other usual mechanisms says it should (otherwise, `condition-case'
+suppresses the debugger).
 
 When a handler handles an error, control returns to the `condition-case'
 and it executes the handler's BODY...
@@ -1700,6 +1704,10 @@ See also the function `condition-case'.  */)
       && (!NILP (Vdebug_on_signal)
           /* If no handler is present now, try to run the debugger.  */
           || NILP (clause)
+          /* A `debug' symbol in the handler list disables the normal
+             suppression of the debugger.  */
+          || (CONSP (clause) && CONSP (XCAR (clause))
+              && !NILP (Fmemq (Qdebug, XCAR (clause))))
           /* Special handler that means "print a message and run debugger
              if requested".  */
           || EQ (h->handler, Qerror)))