elm-make fails with --output NUL on windows environment

[tshm]

/dev/null equivalent in Windows (cmd) is NUL. (e.g. echo "test" > NUL, will throw away stdout)

elm-make should support it as well.

• reproduced with elm-make 0.17.1 on Windows10.

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[elehner]

@tshm, you may have noticed it already, but '/dev/null' is just a hard-coded string in elm-make, and tells the compiler to not save the output to a file. Since it's just a flag it also works in Windows, though it is odd to see --output='/dev/null' while in a command prompt.

Agreed that NUL should also be a valid flag value if nothing else.

[evancz]

As @elehner says, there is a way to do this. I'm not sure if it is a feature request to allow both names though. I will close for now and see if anyone else asks for the alias.