Cannot use the unit type in ports

[toburger]

I'm trying to migrate the code from this blog post into elm 0.17: http://tech.noredink.com/post/126978281075/walkthrough-introducing-elm-to-a-js-web-app
I've got it to work here: https://github.com/toburger/elm-todomvc/tree/feature/elm17

However it is not possible to create a port using a unit type.

When trying to compile this code:
port dispatchDestroyCompleted : (() -> msg) -> Sub msg
I get a runtime error saying: _Tuple0 is not defined

somehow unit gets transpiled into a tuple value.

When I change it to:
port dispatchDestroyCompleted : (List Int -> msg) -> Sub msg
everything works, but it doesn't resemble the intention of the port as clear as before.

[jvoigtlaender]

Known issue with (apparently) known fix. elm/compiler#1367, elm/compiler#1361

[jvoigtlaender]

Known issue with (apparently) known fix. elm/compiler#1367, elm/compiler#1361