numeric.c: preserve encoding

* numeric.c (num_init_copy): preserve encoding of error message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44613 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

numeric.c

@@ -332,7 +332,7 @@ num_sadded(VALUE x, VALUE name)
 static VALUE
 num_init_copy(VALUE x, VALUE y)
 {
-    rb_raise(rb_eTypeError, "can't copy %s", rb_obj_classname(x));
+    rb_raise(rb_eTypeError, "can't copy %"PRIsVALUE, rb_obj_class(x));
 
     UNREACHABLE;
 }

test/ruby/test_numeric.rb

@@ -56,11 +56,20 @@ class TestNumeric < Test::Unit::TestCase
     end
   end
 
-  def test_numeric
+  def test_singleton_method
     a = Numeric.new
     assert_raise_with_message(TypeError, /foo/) { def a.foo; end }
     assert_raise_with_message(TypeError, /\u3042/) { eval("def a.\u3042; end") }
+  end
+
+  def test_dup
+    a = Numeric.new
     assert_raise(TypeError) { a.dup }
+
+    c = Module.new do
+      break eval("class C\u{3042} < Numeric; self; end")
+    end
+    assert_raise_with_message(TypeError, /C\u3042/) {c.new.dup}
   end
 
   def test_quo