class.c: prepend for each classes

* class.c (include_modules_at): allow prepend each modules upto
  once for each classes.  [EXPERIMENTAL]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49332 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 9d6e13d676..8413c4782b 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1725,6 +1725,17 @@ class TestModule < Test::Unit::TestCase
     assert_equal('hello!', foo.new.hello, bug9236)
   end
 
+  def test_multiple_prepend
+    m = labeled_module("M")
+    c1 = labeled_class("C1") {
+      prepend m
+    }
+    c2 = labeled_class("C2", c1) {
+      prepend m
+    }
+    assert_equal([m, c2, m, c1], c2.ancestors[0, 4])
+  end
+
   def test_class_variables
     m = Module.new
     m.class_variable_set(:@@foo, 1)