add verbose stack display option, -Dvs

[p5sagit/p5-mst-13.2.git] / regexec.c

diff --git a/regexec.c b/regexec.c
index 4f403a0..5a7ed12 100644 (file)
--- a/regexec.c
+++ b/regexec.c
@@ -2805,7 +2805,7 @@ S_regmatch(pTHX_ regnode *prog)
                CALLRUNOPS(aTHX);                       /* Scalar context. */
                SPAGAIN;
                if (SP == before)
-                   ret = Nullsv;   /* protect against empty (?{}) blocks. */
+                   ret = &PL_sv_undef;   /* protect against empty (?{}) blocks. */
                else {
                    ret = POPs;
                    PUTBACK;