{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
impl<'tcx> Visitor<'tcx> for GatherUsedMutsVisitor<'_, '_, '_, 'tcx> {
    fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location) {