mirror of https://github.com/rust-lang/cargo
eff37342ab
Add special `check-cfg` lint config for the `unexpected_cfgs` lint
This PR adds a special `check-cfg` lint config for the `unexpected_cfgs` lint, as it was decided by T-cargo (in today's meeting).
The goal of this lint config is to provide a simple and cost-less alternative to the build-script `cargo::rustc-check-cfg` instruction.
```toml
[lints.rust]
unexpected_cfgs = { check-cfg = ["cfg(foo, values(\"bar\"))"] }
```
Regarding the implementation, everything is as straight forward as possible, nothing over-engineered; I added the possibility to omit the `level` field if a sub-config is specified instead, since it seems useful and was easy to implement.
There are many small-ish commit, I recommend reviewing them independently.
r? `@epage` (or `@weihanglo` maybe)
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