Tidy up change #18751, so that the second parameter to unpack()

defaults to $_ at compile-time, instead of run-time (like all
other primitives that default to $_).
p4raw-link: @18751 on //depot/perl: 13dcffc60adeca175c32a1ea11ec8756d4853ad2

p4raw-id: //depot/perl@22047

1 files changed, 1 insertions, 0 deletions

diff --git a/pp.sym b/pp.sym
index f2dbb0bd6b..00d4e7eef3 100644
--- a/pp.sym
+++ b/pp.sym
@@ -43,6 +43,7 @@ Perl_ck_subr
 Perl_ck_substr
 Perl_ck_svconst
 Perl_ck_trunc
+Perl_ck_unpack
 Perl_pp_null
 Perl_pp_stub
 Perl_pp_scalar