eval_error.c: Fix a format of `NameError#message`

* eval_error.c (undef_mesg_for): fix typo.  Before this commit
  `ArgumentError: malformed format string - %$` was raised when
  `NameError#message` is called.  [ruby-core:71282] [Bug #11640]
  [Fix GH-1077]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52400 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index f8ddd9d3fa..d0ed477916 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -721,4 +721,16 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
     assert_raise(NameError) {a.instance_eval("foo")}
     assert_raise(NoMethodError, bug10969) {a.public_send("bar", true)}
   end
+
+  def test_message_of_name_error
+    begin
+      Module.new do
+        module_function :foo
+      end
+    rescue => e
+      error = e
+    end
+
+    assert_match /\Aundefined method `foo' for module `#<Module:.*>'\z/, error.message
+  end
 end