suppress warning for VC12

It says "warning C4146: unary minus operator applied
to unsigned type, result still unsigned"


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/insns.def b/insns.def
index 622f3b05c9..8f43e55b8a 100644
--- a/insns.def
+++ b/insns.def
@@ -610,7 +610,7 @@ adjuststack
 (rb_num_t n)
 (...)
 (...)
-// attr rb_snum_t sp_inc = -n;
+// attr rb_snum_t sp_inc = -(rb_snum_t)n;
 {
     DEC_SP(n);
 }