thread.c: class name encoding

* thread.c (thread_s_new): preserve the encoding of the class name
  in an error message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50328 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 15 insertions, 2 deletions

diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index 87d5f0f79e..ade680c55b 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1033,4 +1033,17 @@ q.pop
     assert_not_predicate(status, :signaled?, FailDesc[status, bug9751, output])
     assert_predicate(status, :success?, bug9751)
   end if Process.respond_to?(:fork)
+
+  def test_subclass_no_initialize
+    t = Module.new do
+      break eval("class C\u{30b9 30ec 30c3 30c9} < Thread; self; end")
+    end
+    t.class_eval do
+      def initialize
+      end
+    end
+    assert_raise_with_message(ThreadError, /C\u{30b9 30ec 30c3 30c9}/) do
+      t.new {}
+    end
+  end
 end
diff --git a/thread.c b/thread.c
index bd517366cd..6cf6d52727 100644
--- a/thread.c
+++ b/thread.c
@@ -736,8 +736,8 @@ thread_s_new(int argc, VALUE *argv, VALUE klass)
     rb_obj_call_init(thread, argc, argv);
     GetThreadPtr(thread, th);
     if (!th->first_args) {
-	rb_raise(rb_eThreadError, "uninitialized thread - check `%s#initialize'",
-		 rb_class2name(klass));
+	rb_raise(rb_eThreadError, "uninitialized thread - check `%"PRIsVALUE"#initialize'",
+		 klass);
     }
     return thread;
 }