{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
        let _p = tracing::info_span!("ExpansionInfo::new").entered();
    pub fn new(db: &dyn ExpandDatabase, macro_file: MacroCallId) -> ExpansionInfo {
        let loc = db.lookup_intern_macro_call(macro_file);