{"ast_node_type":"function","tokens":[{"end":80,"kind":"keyword","start":0,"text":"fn"}]}
    fn find_breakable(&mut self, target_id: HirId) -> &mut BreakableCtxt<'tcx> {
impl<'tcx> EnclosingBreakables<'tcx> {
        self.opt_find_breakable(target_id).unwrap_or_else(|| {