prepend: fix ancestors order

* class.c (rb_mod_ancestors): fix ancestors order.
  [ruby-core:45919][Bug #6658] [ruby-dev:45861][Bug #6659]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36241 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 31 insertions, 3 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index d7a6248909..0802048e10 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1273,9 +1273,9 @@ class TestModule < Test::Unit::TestCase
 
   def test_prepend_inheritance
     bug6654 = '[ruby-core:45914]'
-    a = Module.new
-    b = Module.new {include a}
-    c = Class.new {prepend b}
+    a = labeled_module("a")
+    b = labeled_module("b") {include a}
+    c = labeled_class("c") {prepend b}
     assert_operator(c, :<, b, bug6654)
     assert_operator(c, :<, a, bug6654)
   end
@@ -1299,4 +1299,32 @@ class TestModule < Test::Unit::TestCase
       end
     end
   end
+
+  def test_prepend_class_ancestors
+    bug6658 = '[ruby-core:45919]'
+    m = labeled_module("m")
+    c = labeled_class("c") {prepend m}
+    assert_equal([m, c], c.ancestors[0, 2], bug6658)
+  end
+
+  def test_prepend_module_ancestors
+    bug6659 = '[ruby-dev:45861]'
+    m0 = labeled_module("m0")
+    m1 = labeled_module("m1") {prepend m0}
+    assert_equal([m0, m1], m1.ancestors, bug6659)
+  end
+
+  def labeled_module(name, &block)
+    Module.new do
+      singleton_class.class_eval {define_method(:to_s) {name}}
+      class_eval(&block) if block
+    end
+  end
+
+  def labeled_class(name, superclass = Object, &block)
+    Class.new(superclass) do
+      singleton_class.class_eval {define_method(:to_s) {name}}
+      class_eval(&block) if block
+    end
+  end
 end