-w interacts badly with -Dt

diff --git a/sv.c b/sv.c
index ece94b9..53499fd 100644 (file)
--- a/sv.c
+++ b/sv.c
@@ -889,6 +889,7 @@ register SV *sv;
     STRLEN prevlen;
     int unref = 0;
 
+    sv_setpvn(t, "", 0);
   retry:
     if (!sv) {
        sv_catpv(t, "VOID");