fix a bug in Module#remove_method which it could call undefined method if call it once

Watson1978 · Watson1978 · commit 4c066464948b · 2013-05-20T07:59:54.000+09:00
Test Code:
----
class Foo
  def meth
  end
end

obj = Foo.new
obj.meth

class Foo
  remove_method :meth
end
p obj.meth

Result:
----
$ macruby test_remove.rb
nil

Expected:
----
$ ruby test_remove.rb
test_remove.rb:12:in `&lt;main&gt;': undefined method `meth' for #&lt;Foo:0x007fad558b9cc8&gt; (NoMethodError)
diff --git a/vm.cpp b/vm.cpp
@@ -2871,6 +2871,7 @@ RoxorCore::remove_method(Class klass, SEL sel)
     assert(m != NULL);
     method_setImplementation(m, (IMP)rb_vm_removed_imp);
     invalidate_respond_to_cache();
+    invalidate_method_cache(sel);
 
     ID mid = sanitize_mid(sel);
     if (mid != 0) {
