{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"///"}]}
    /// function is unreachable, and there hasn't been another warning.
    /// Produces warning on the given node, if the current point in the
    pub(crate) fn warn_if_unreachable(&self, id: HirId, span: Span, kind: &str) {