* numeric.c (fix_to_s): avoid rb_scan_args() when no argument

  given. 
* bignum.c (rb_big_to_s): ditto.
* enum.c (enum_first): ditto.
* eval_jump.c (rb_f_catch): ditto.
* io.c (rb_obj_display): ditto.
* class.c (rb_obj_singleton_methods): ditto.
* object.c (rb_class_initialize): ditto.
* random.c (rb_f_srand): ditto.
* range.c (range_step): ditto.
* re.c (rb_reg_s_last_match): ditto.
* string.c (rb_str_to_i): ditto.
* string.c (rb_str_each_line): ditto.
* string.c (rb_str_chomp_bang): ditto.
* string.c (rb_str_sum): ditto.

* string.c (str_modifiable): declare inline.
* string.c (str_independent): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15691 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 2 deletions

diff --git a/io.c b/io.c
index f7aec96660..8d2f8e088a 100644
--- a/io.c
+++ b/io.c
@@ -4642,10 +4642,12 @@ rb_obj_display(int argc, VALUE *argv, VALUE self)
 {
     VALUE out;
 
-    if (rb_scan_args(argc, argv, "01", &out) == 0) {
+    if (argc == 0) {
 	out = rb_stdout;
     }
-
+    else {
+	rb_scan_args(argc, argv, "01", &out);
+    }
     rb_io_write(out, self);
 
     return Qnil;