For 5.12: saner behaviour for `length`

[p5sagit/p5-mst-13.2.git] / sv.h

diff --git a/sv.h b/sv.h
index 1d7555f..9ab1c94 100644 (file)
--- a/sv.h
+++ b/sv.h
@@ -1685,6 +1685,8 @@ Like C<sv_catsv> but doesn't process magic.
 #define SV_COW_SHARED_HASH_KEYS        512
 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
 #define SV_COW_OTHER_PVS       1024
+/* Make sv_2pv_flags return NULL if something is undefined.  */
+#define SV_UNDEF_RETURNS_NULL  2048
 
 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
    So only default to doing the COW setup if we're in the core.