assert that HvARRAY is NULL when freeing an HV

The code path that leads to HvAUX being empty and thus HvARRAY being
freed, is non-obvious: so put in an assert against any future failure.

diff --git a/sv.c b/sv.c
index 7ce4b6d..534638c 100644 (file)
--- a/sv.c
+++ b/sv.c
@@ -6102,6 +6102,7 @@ Perl_sv_clear(pTHX_ SV *const orig_sv)
                PL_last_swash_hv = NULL;
            }
            Perl_hv_undef_flags(aTHX_ MUTABLE_HV(sv), HV_NAME_SETALL);
+           assert(!HvARRAY((HV*)sv));
            break;
        case SVt_PVAV:
            {