allow mocked.On("X").Return(func(a Arguments) Arguments { return nil })

[gburt]

I've submitted this upstream at stretchr#742 but in 2 years they haven't even commented on it

[nik-andreev]

I guess this will make mocking functions that return functions harder, but I don't think we have this problem.

[gburt]

I guess this will make mocking functions that return functions harder, but I don't think we have this problem.

Not much harder - it pattern matches against the given func, and ignores things that don't have the right signature.