Deprecate assignment to $[

Based on a patch by James Mastros :

Subject: Deprecating $[
Message-ID: <abc933c50904020726x31776ab5m192036429af16f03@mail.gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/op.c b/op.c
index b88931960f..517f6483ed 100644
--- a/op.c
+++ b/op.c
@@ -4355,6 +4355,7 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
 	    PL_eval_start = 0;
 	else {
 	    if (!PL_madskills) { /* assignment to $[ is ignored when making a mad dump */
+		deprecate("assignment to $[");
 		op_free(o);
 		o = newSVOP(OP_CONST, 0, newSViv(CopARYBASE_get(&PL_compiling)));
 		o->op_private |= OPpCONST_ARYBASE;