* vm_insnhelper.c (vm_setup_method): should not enable tail call

optimization for frames with VM_FRAME_FLAG_FINISH.
  [ruby-dev:46065] [Bug #6901]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36771 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_optimization.rb

@@ -160,4 +160,25 @@ class TestRubyOptimization < Test::Unit::TestCase
     EOF
     assert_equal(9131, Tailcall.new.fact(3000).to_s.size, bug4082)
   end
+
+  def test_tailcall_with_block
+    bug6901 = '[ruby-dev:46065]'
+
+    option = {
+      tailcall_optimization: true,
+      trace_instruction: false,
+    }
+    iseq = RubyVM::InstructionSequence.new(<<-EOF, "Bug#6901", bug6901, nil, option).eval
+  def identity(val)
+    val
+  end
+
+  def delay
+    -> {
+      identity(yield)
+    }
+  end
+    EOF
+    assert_equal(123, delay { 123 }.call, bug6901)
+  end
 end