* io.c (rb_io_s_foreach): argument check before making Enumerator.

  [ruby-dev:31525]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34736 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/io.c b/io.c
index add37237ab..9301dc6814 100644
--- a/io.c
+++ b/io.c
@@ -8969,10 +8969,11 @@ static VALUE
 rb_io_s_foreach(int argc, VALUE *argv, VALUE self)
 {
     VALUE opt;
+    int orig_argc = argc;
     struct foreach_arg arg;
 
-    RETURN_ENUMERATOR(self, argc, argv);
     argc = rb_scan_args(argc, argv, "13:", NULL, NULL, NULL, NULL, &opt);
+    RETURN_ENUMERATOR(self, orig_argc, argv);
     open_key_args(argc, argv, opt, &arg);
     if (NIL_P(arg.io)) return Qnil;
     return rb_ensure(io_s_foreach, (VALUE)&arg, rb_io_close, arg.io);