rustc::declare_lint!

macro_rules! declare_lint {
    // FIXME(#14660): deduplicate
    (pub $name:ident, $level:ident, $desc:expr) => (
        pub static $name: &'static ::rustc::lint::Lint
            = &lint_initializer!($name, $level, $desc);
    );
    ($name:ident, $level:ident, $desc:expr) => (
        static $name: &'static ::rustc::lint::Lint
            = &lint_initializer!($name, $level, $desc);
    );
}

Declare a static item of type &'static Lint.