{"ast_node_type":"function","tokens":[{"end":57,"kind":"keyword","start":0,"text":"fn"}]}
    fn encode_crate_num(&mut self, crate_num: CrateNum) {
impl<'a, 'tcx> SpanEncoder for EncodeContext<'a, 'tcx> {
        if crate_num != LOCAL_CRATE && self.is_proc_macro {