nobu	2015-05-25 11:33:36 +0900 (Mon, 25 May 2015)

  New Revision: 50636

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=50636

  Log:
    io.c: refine message
    
    * io.c (prepare_getline_args): refine the expected arity in an
      exception message.

  Modified files:
    trunk/io.c
Index: io.c
===================================================================
--- io.c	(revision 50635)
+++ io.c	(revision 50636)
@@ -3112,6 +3112,7 @@ prepare_getline_args(int argc, VALUE *ar https://github.com/ruby/ruby/blob/trunk/io.c#L3112
     VALUE rs = rb_rs, lim = Qnil;
     rb_io_t *fptr;
 
+    rb_check_arity(argc, 0, 2);
     if (argc == 1) {
         VALUE tmp = Qnil;
 
@@ -3123,7 +3124,7 @@ prepare_getline_args(int argc, VALUE *ar https://github.com/ruby/ruby/blob/trunk/io.c#L3124
         }
     }
     else if (2 <= argc) {
-        rb_scan_args(argc, argv, "2", &rs, &lim);
+	rs = argv[0], lim = argv[1];
         if (!NIL_P(rs))
             StringValue(rs);
     }

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