`cargo version` unwraps `None`

[anna-is-cute]

RUST_BACKTRACE=full cargo version results in this. That backtrace is from macOS 10.12.4 beta.

I have verified this issue exists on both macOS and Arch. Arch backtrace.

[TyOverby]

currently failing on travis

https://travis-ci.org/TyOverby/bincode/jobs/212339208

[anna-is-cute]

I found #3819, but it looks like that was supposed to be fixed, and this issue still persists in rustc 1.17.0-nightly (a559452b0 2017-03-17).

[NoraCodes]

Also happens for me https://api.travis-ci.org/jobs/212348423/

[SergioBenitez]

😢

[alexcrichton]

Fixed in rust-lang/rust#40625

sorry for the breakage!

[wagenet]

Is there a temporary workaround for this? It's killing all of our CI tests.

[abonander]

I've disabled the nightly branch in my Travis config for the time being, otherwise I don't know.

[diggyk]

I need nightly to do my build. How long does a fix like this make it into nightly?

[abonander]

It's been approved as high-priority so it should merge tonight, but then there's rollup merging and testing and that takes a day or two to go through (unless high-priority PRs skip rollups), so maybe Monday's nightly?

[Arnavion]

Usually one configures travis to ignore failures on nightly. If your code only builds with nightly, then you might want to consider pinning it to a known good version. It's nightly after all; it can break.