Macro rustc_ap_rustc_session::declare_tool_lint

macro_rules! declare_tool_lint {
    (
        $(#[$attr:meta])* $vis:vis $tool:ident ::$NAME:ident, $Level: ident, $desc: expr
    ) => { ... };
    (
        $(#[$attr:meta])* $vis:vis $tool:ident ::$NAME:ident, $Level:ident, $desc:expr,
        report_in_external_macro: $rep:expr
    ) => { ... };
    (
        $(#[$attr:meta])* $vis:vis $tool:ident ::$NAME:ident, $Level:ident, $desc:expr,
        $external:expr
    ) => { ... };
}