* vm_eval.c (check_funcall): Raise ArgumentError if respond_to?

	  requires more than three arguments. [Bug #6000]
	* test/ruby/test_object.rb (class TestObject):  Test for respond_to?
	  requiring more than three arguments.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35025 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index f4a38e0ee3..271ab600a2 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -460,6 +460,24 @@ class TestObject < Test::Unit::TestCase
     assert_equal([[:respond_to?, :to_ary]], called, '[bug:6000]')
   end
 
+  def test_implicit_respond_to_arity_3
+    p = Object.new
+
+    called = []
+    p.singleton_class.class_eval do
+      define_method(:respond_to?) do |a, b, c|
+        called << [:respond_to?, a, b, c]
+        false
+      end
+    end
+
+    e = assert_raises(ArgumentError, '[bug:6000]') do
+      [[p]].flatten
+    end
+
+    assert_equal('respond_to? must accept 1 or 2 arguments (requires 3)',                        e.message)
+  end
+
   def test_method_missing_passed_block
     bug5731 = '[ruby-dev:44961]'