| deferred |
deferred := JQuery current Deferred new.
[deferred resolve: 'ok'] valueWithTimeout: 1000.
deferred promise then: 
raises the error: nil does not understand #applyTo:arguments:
This is due to the TThenable>>#then: not being initialized, that is instantiateFn not being used to set method.fn.
It seems to be related to commit d8ba5d3b0f
The example uses a jquery deferred, but the problem is common to other thenables.