eval.c: check type

* eval.c (ignored_block): check argument type, which must be
  Module.  [ruby-dev:50270] [Bug #13956]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60077 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

eval.c

@@ -1482,6 +1482,7 @@ static void
 ignored_block(VALUE module, const char *klass)
 {
     const char *anon = "";
+    Check_Type(module, T_MODULE);
     if (!RTEST(rb_search_class_path(module))) {
 	anon = ", maybe for Module.new";
     }

test/ruby/test_refinement.rb

@@ -1961,6 +1961,27 @@ class TestRefinement < Test::Unit::TestCase
     end
   end
 
+  def test_using_wrong_argument
+    bug = '[ruby-dev:50270] [Bug #13956]'
+    pattern = /expected Module/
+    assert_separately([], "#{<<-"begin;"}\n#{<<-'end;'}")
+    bug = ""#{bug.dump}
+    pattern = /#{pattern}/
+    begin;
+      assert_raise_with_message(TypeError, pattern, bug) {
+        using(1) do end
+      }
+    end;
+    assert_separately([], "#{<<-"begin;"}\n#{<<-'end;'}")
+    bug = ""#{bug.dump}
+    pattern = /#{pattern}/
+    begin;
+      assert_raise_with_message(TypeError, pattern, bug) {
+        Module.new {using(1) {}}
+      }
+    end;
+  end
+
   class ToString
     c = self
     using Module.new {refine(c) {def to_s; "ok"; end}}