From 18f0a65018dd357a1815941618d3cf9f274e6239 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 17 Jul 2011 06:30:10 +0000
Subject: [PATCH] * error.c (rb_warn_m): accept multiple args in like puts. 
 rdoc   patch by Erik Price at [ruby-core:38119].  [Feature #5029]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32568 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog            |  5 +++++
 error.c              | 23 +++++++++++++++--------
 test/ruby/test_io.rb | 17 +++++++++++++++++
 3 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 9dfe973ee3..6f6b3f9cde 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Jul 17 15:30:04 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* error.c (rb_warn_m): accept multiple args in like puts.  rdoc
+	  patch by Erik Price at [ruby-core:38119].  [Feature #5029]
+
 Sun Jul 17 07:56:31 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
 
 	* test/openssl/test_ssl_session.rb: add PEM SSL session without TLS
diff --git a/error.c b/error.c
index ce959fc221..53f5472efc 100644
--- a/error.c
+++ b/error.c
@@ -225,18 +225,25 @@ rb_warning(const char *fmt, ...)
 
 /*
  * call-seq:
- *    warn(msg)   -> nil
+ *    warn(msg, ...)   -> nil
  *
- * Display the given message (followed by a newline) on STDERR unless
- * warnings are disabled (for example with the <code>-W0</code> flag).
+ * Displays each of the given messages followed by a record separator on
+ * STDERR unless warnings have been disabled (for example with the
+ * <code>-W0</code> flag).
+ *
+ *    warn("warning 1", "warning 2")
+ *
+ *  <em>produces:</em>
+ *
+ *    warning 1
+ *    warning 2
  */
 
 static VALUE
-rb_warn_m(VALUE self, VALUE mesg)
+rb_warn_m(int argc, VALUE *argv, VALUE exc)
 {
-    if (!NIL_P(ruby_verbose)) {
-	rb_io_write(rb_stderr, mesg);
-	rb_io_write(rb_stderr, rb_default_rs);
+    if (!NIL_P(ruby_verbose) && argc > 0) {
+	rb_io_puts(argc, argv, rb_stderr);
     }
     return Qnil;
 }
@@ -1572,7 +1579,7 @@ Init_Exception(void)
 
     rb_mErrno = rb_define_module("Errno");
 
-    rb_define_global_function("warn", rb_warn_m, 1);
+    rb_define_global_function("warn", rb_warn_m, -1);
 }
 
 void
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 0325867496..c62edbba00 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1975,4 +1975,21 @@ End
     write_file.close
     file.close!
   end
+
+  def test_warn
+    stderr = EnvUtil.verbose_warning do
+      warn "warning"
+    end
+    assert_equal("warning\n", stderr)
+
+    stderr = EnvUtil.verbose_warning do
+      warn
+    end
+    assert_equal("", stderr)
+
+    stderr = EnvUtil.verbose_warning do
+      warn "[Feature #5029]", "[ruby-core:38070]"
+    end
+    assert_equal("[Feature #5029]\n[ruby-core:38070]\n", stderr)
+  end
 end