I think

Message does not exist

Makes more sense, I always found the use of the word understood kinda weird
On Thu, 8 Dec 2016 at 10:38, phil@highoctane.be <phil@highoctane.be> wrote:
MyClass did not understand #message

Phil


On Thu, Dec 8, 2016 at 11:24 AM, Denis Kudriashov <dionisiydk@gmail.com> wrote:

2016-12-08 10:59 GMT+01:00 phil@highoctane.be <phil@highoctane.be>:
What if the method is on class side?

Good question. It will be��
an instance of MyClass class did not understand #message
which of course not so good. What you suggest?