Compiler: Incoming ports that take unit as an argument causes a crash at runtime

[ccapndave]

If you have an incoming port with the unit type:

port myIncomingPort : (() -> msg) -> Sub msg

this causes a crash when trying to embed the Elm application in Javascript:

Main.js:9940 Uncaught ReferenceError: _Tuple0 is not defined(anonymous function) @ Main.js:9940(anonymous function) @ Main.js:11929
app.ts:33 ReferenceError: Elm is not defined(…)

[eeue56]

https://github.com/elm-lang/elm-compiler/pull/1361

ping @lukewestby

[lukewestby]

I haven't reopened that PR because I haven't had time to get an elm dev env set up to test the fix. If someone wants to take that code and test it and submit a new pr that would be excellent

[lukewestby]

Until then, if anyone is experiencing this bug you can work around it by sending an empty record {} over the port instead