Prefer rb_check_arity when 0 or 1 arguments

Especially over checking argc then calling rb_scan_args just to
raise an ArgumentError.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66238 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 6 deletions

diff --git a/range.c b/range.c
index 9661feb718..c30852e500 100644
--- a/range.c
+++ b/range.c
@@ -397,12 +397,7 @@ range_step(int argc, VALUE *argv, VALUE range)
 
     b = RANGE_BEG(range);
     e = RANGE_END(range);
-    if (argc == 0) {
-        step = INT2FIX(1);
-    }
-    else {
-        rb_scan_args(argc, argv, "01", &step);
-    }
+    step = (!rb_check_arity(argc, 0, 1) ? INT2FIX(1) : argv[0]);
 
     if (!rb_block_given_p()) {
         if (rb_obj_is_kind_of(b, rb_cNumeric) && (NIL_P(e) || rb_obj_is_kind_of(e, rb_cNumeric))) {