What's the minimum rustc version supported?

[behnam]

With rust-1.17.0 or rust-1.18.0, I'm get this error on build time:

error: use of unstable library feature 'command_envs' (see issue #38526)
   --> /Users/behnam/.cargo/registry/src/github.com-1ecc6299db9ec823/assert_cli-0.5.4/src/assert.rs:303:14
    |
303 |             .envs(self.env.clone().compile())
    |              ^^^^

It's fine on stable channel, which is at rust-1.21.0 right now. So, the minimum version supported in larger that 1.18.0, less than or equal to 1.21.0.

Looking at the .travis.yml file here, I noticed there's no minimum rustc version being maintained.

Could you please indicate what's the minimum rustc version supported by assert_cli?

FYI, if supporting versions a few months old is not a goal here, I will have to to gate my cli test behind a feature, which would make my CI script more complicated.

So, any chance we can have some versions older than stable also supported?

---

• assert_cli version: v0.5.4
• Rust version: 1.17.0
• OS and version: Darwin Marv.local 16.7.0 Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64 x86_64

[epage]

Looks like that feature was stablized in 1.19 https://github.com/rust-lang/rust/blob/master/RELEASES.md#stabilized-apis-2

What is your use case for holding back your rustc version?

[behnam]

Right. I looked into the code and noticed that assert_cli has a bunch of features from 1.19.0.

I'm tracking Firefox's minimum rustc version for UNIC, as also do many Servo projects. Here's the status for Firefox: https://wiki.mozilla.org/Oxidation

Basically, it's currently 1.17.0, but in a few days will become 1.19.0.

In many projects, we add a specific rust version to .travis.yml, which will make sure new code is always compatible. Would love to see that happen in assert_cli, as it makes the project more reliable.

[epage]

Thanks. I hear of discussions of libraries supporting old stable versions but haven't heard too much the use case of why their users need them.

I think other crates are doing a stable-2. Something for us to consider. (and yes, if we do it, we would have the CI enforce it).

[killercup]

Looking into the future a bit, I don't think we'll need any of the features stabilized in 1.23. Not sure about our dependencies, though.

I'm fine with adding a 1.19 build to Travis.

Ed Page [email protected] schrieb am Di. 7. Nov. 2017 um 06:27:

Thanks. I hear of discussions of libraries supporting old stable versions but haven't heard too much the use case of why their users need them.

I think other crates are doing a stable-2. Something for us to consider. (and yes, if we do it, we would have the CI enforce it).

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