class.c: exclude original module

* class.c (rb_mod_included_modules): should not include the original
  module itself.  [ruby-core:53158] [Bug #8025]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40612 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed May  8 22:46:59 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* class.c (rb_mod_included_modules): should not include the original
+	  module itself.  [ruby-core:53158] [Bug #8025]
+
 Wed May  8 17:43:55 2013  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* io.c (rb_io_ext_int_to_encs): ignore internal encoding if external

class.c

@@ -851,9 +851,10 @@ rb_mod_included_modules(VALUE mod)
 {
     VALUE ary = rb_ary_new();
     VALUE p;
+    VALUE origin = RCLASS_ORIGIN(mod);
 
     for (p = RCLASS_SUPER(mod); p; p = RCLASS_SUPER(p)) {
-	if (BUILTIN_TYPE(p) == T_ICLASS) {
+	if (p != origin && BUILTIN_TYPE(p) == T_ICLASS) {
 	    rb_ary_push(ary, RBASIC(p)->klass);
 	}
     }

test/ruby/test_module.rb

@@ -1548,6 +1548,13 @@ class TestModule < Test::Unit::TestCase
     assert_nothing_raised(NoMethodError, bug8005) {a.send :foo}
   end
 
+  def test_prepend_included_modules
+    bug8025 = '[ruby-core:53158] [Bug #8025]'
+    mixin = labeled_module("mixin")
+    c = labeled_module("c") {prepend mixin}
+    assert_not_include(c.included_modules, c, bug8025)
+  end
+
   def test_class_variables
     m = Module.new
     m.class_variable_set(:@@foo, 1)