Use edition = "2018"

[TimDiekmann]

Uses edition 2018 and removes try!, as it's not available anymore in 2018.

With those changes it should be trivial to add no_std support as core can be used everywhere except in std::error.

cc #33

[tailhook]

Hi! Thank you for your work.

Do you mean this macro can't be used as is in 2018? Can we just remove try macro but don't bump edition? (I'm still not sure whether it's already the time and if bumping a minimum rust version is a non-breaking change).

[TimDiekmann]

No it's working with 2018. I just wanted to work a bit towards no_std support, and for testing this, it's easier with "edition = 2018" as no extern crate core is needed. But you are right that bumping a minimum version of rust is maybe a little bit too early, however, in CI you don't have tests for older versions, you only test the current stable.

The change to edition 2018 shouldn't be a breaking change anyway, as try! is only used in tests.

[TimDiekmann]

Feel free to just close this, it wasn't a that big effort 🙂

[kornelski]

It would be good to merge this. try! generates deprecation warnings now.