On 0.8.2 booish, I executed the following:
>>>def foo(a as callable()):
... print a is null
...
>>>foo:
... print 'a'
...
False
>>>foo
Input3Module.foo
>>>foo:
... pass
...
Input3Module.foo
I would expect the output to be call to the method with an empty delegate.
Fixed in the repository. Thanks for the report!