* backport r39276 from trunk. [ruby-dev:46997] [Bug #7825]

* vm.c (rb_thread_mark): mark a working Proc of bmethod
  (a method defined by define_method) even if the method was removed.
  We could not trace working Proc object which represents the body
  of bmethod if the method was removed (alias/undef/overridden).
  Simply, it was mark miss.
  This patch by Kazuki Tsujimoto. [Bug #7825]

  NOTE: We can brush up this marking because we do not need to mark
  `me' on each living control frame. We need to mark `me's
  only if `me' was free'ed. This is future work after Ruby 2.0.0.

* test/ruby/test_method.rb: add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39279 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/ruby/test_method.rb b/test/ruby/test_method.rb
index 03d7cab2d7..23b348a94f 100644
--- a/test/ruby/test_method.rb
+++ b/test/ruby/test_method.rb
@@ -522,4 +522,18 @@ class TestMethod < Test::Unit::TestCase
     assert_equal(x.singleton_class, x.method(:bar).owner)
     assert(x.method(:foo) != x.method(:bar), bug7613)
   end
+
+  def test_gced_bmethod
+    assert_normal_exit %q{
+      require 'irb'
+      IRB::Irb.module_eval do
+        define_method(:eval_input) do
+          IRB::Irb.module_eval { alias_method :eval_input, :to_s }
+          GC.start
+          Kernel
+        end
+      end
+      IRB.start
+    }, '[Bug #7825]'
+  end
 end