@Override public RubySymbol execute(VirtualFrame frame) { notDesignedForCompilation(); final Object receiverObject = receiver.execute(frame); final RubyMethod methodObject = (RubyMethod) method.execute(frame); RubyModule module; if (receiverObject instanceof RubyModule) { module = (RubyModule) receiverObject; } else { module = ((RubyBasicObject) receiverObject).getSingletonClass(this); } final RubyMethod methodWithDeclaringModule = methodObject.withDeclaringModule(module); if (moduleFunctionFlag(frame)) { module.addMethod(this, methodWithDeclaringModule.withVisibility(Visibility.PRIVATE)); module .getSingletonClass(this) .addMethod(this, methodWithDeclaringModule.withVisibility(Visibility.PUBLIC)); } else { module.addMethod(this, methodWithDeclaringModule); } return getContext().newSymbol(method.getName()); }