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, 2 insertions, 9 deletions

diff --git a/vm_eval.c b/vm_eval.c
index 47191a0aab..9e1563dd8d 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1949,16 +1949,9 @@ catch_i(VALUE tag, VALUE data)
  */
 
 static VALUE
-rb_f_catch(int argc, VALUE *argv)
+rb_f_catch(int argc, VALUE *argv, VALUE self)
 {
-    VALUE tag;
-
-    if (argc == 0) {
-	tag = rb_obj_alloc(rb_cObject);
-    }
-    else {
-	rb_scan_args(argc, argv, "01", &tag);
-    }
+    VALUE tag = rb_check_arity(argc, 0, 1) ? argv[0] : rb_obj_alloc(rb_cObject);
     return rb_catch_obj(tag, catch_i, 0);
 }