&CORE::wantarray()

This commit allows &CORE::wantarray to be called via ampersand syntax
or through references.

It adds a new private flag for wantarray, OPpOFFBYONE, which caller
will use as well, telling wantarray (or caller) to look one call fur-
ther up the call stack.

1 files changed, 3 insertions, 0 deletions

diff --git a/op.h b/op.h
index f01e0bf07f..6a6e3f2d10 100644
--- a/op.h
+++ b/op.h
@@ -296,6 +296,9 @@ Deprecated.  Use C<GIMME_V> instead.
 /* Private for OP_ENTEREVAL */
 #define OPpEVAL_HAS_HH		2	/* Does it have a copy of %^H */
     
+/* Private for OP_CALLER and OP_WANTARRAY */
+#define OPpOFFBYONE		128	/* Treat caller(1) as caller(2) */
+
 struct op {
     BASEOP
 };