Revert "make it an error to look for magic hv backref"

This reverts commit 64345bb5cdba725a5e2af06c99aa36d8a1b8b873.

diff --git a/sv.c b/sv.c
index b2383fd..c762357 100644 (file)
--- a/sv.c
+++ b/sv.c
@@ -5373,16 +5373,14 @@ Perl_sv_del_backref(pTHX_ SV *const tsv, SV *const sv)
 
     PERL_ARGS_ASSERT_SV_DEL_BACKREF;
 
-    if (SvTYPE(tsv) == SVt_PVHV) {
-       if (SvOOK(tsv)) {
-           /* SvOOK: We must avoid creating the hv_aux structure if its
-            * not already there, as that is stored in the main HvARRAY(),
-            * and hfreentries assumes that no-one reallocates HvARRAY()
-            * while it is running.  */
-           av = *Perl_hv_backreferences_p(aTHX_ MUTABLE_HV(tsv));
-       }
-    }
-    else {
+    if (SvTYPE(tsv) == SVt_PVHV && SvOOK(tsv)) {
+       av = *Perl_hv_backreferences_p(aTHX_ MUTABLE_HV(tsv));
+       /* We mustn't attempt to "fix up" the hash here by moving the
+          backreference array back to the hv_aux structure, as that is stored
+          in the main HvARRAY(), and hfreentries assumes that no-one
+          reallocates HvARRAY() while it is running.  */
+    }
+    if (!av) {
        const MAGIC *const mg
            = SvMAGICAL(tsv) ? mg_find(tsv, PERL_MAGIC_backref) : NULL;
        if (mg)