hv_ename_delete should not delete the HvNAME

This is something that 78b79c7758 missed.

When xhv_name is a HEK *, it is both the regular name and the effect-
ive name at the same time. Only when xhv_name_count is negative is the
regular name not also the effective name.

hv_ename_delete needs to take the HEK that xhv_name points to and
put it in a new HEK * array in xhv_name. This array will just have
one element.

When xhv_name_count is negative, effective names start with the second
element. So we set xhv_name_count to -1 so there isn’t one.

1 files changed, 4 insertions, 2 deletions

diff --git a/hv.c b/hv.c
index 72793e5959..91b8b8c68d 100644
--- a/hv.c
+++ b/hv.c
@@ -2180,8 +2180,10 @@ Perl_hv_ename_delete(pTHX_ HV *hv, const char *name, U32 len)
         HEK_LEN(aux->xhv_name) == (I32)len
      && memEQ(HEK_KEY(aux->xhv_name), name, len)
     ) {
-	unshare_hek_or_pvn(aux->xhv_name, 0, 0, 0);
-	aux->xhv_name = NULL;
+	const HEK * const namehek = aux->xhv_name;
+	Newxc(aux->xhv_name, 1, HEK *, HEK);
+	*(const HEK **)aux->xhv_name = namehek;
+	aux->xhv_name_count = -1;
     }
 }