[Pkg-rust-maintainers] dh-cargo_5_source.changes ACCEPTED into unstable

[Ximin Luo]

Josh Triplett:
> On Mon, Jun 18, 2018 at 08:25:14AM +0000, Debian FTP Masters wrote:
>>    * Pass `--cap-lints warn` in rustflags to avoid builds breaking when rustc
>>      adds new warnings.
> 
> What is the rationale for this? Rust already does this for dependent
> crates. And I don't think it makes sense to do it for the top-level
> crate.
> 

We test-build the thing in dh_auto_test (with "cargo build") and it breaks otherwise.

I do think it's good to do it even for "cargo install" because compiler warnings change and I don't want that to break old crates. For well-maintained crates it's a useful signal for the crate developer, but it's a hindrance for us when the crate gets old and we have a newer compiler.

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