Macro rustc::declare_lint

macro_rules! declare_lint {
    ($vis: vis $NAME: ident, $Level: ident, $desc: expr) => { ... };
}

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Declare a static item of type &'static Lint.