{"ast_node_type":"function","tokens":[{"end":76,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_opaque_ty(&mut self, opaque: &'tcx rustc_hir::OpaqueTy<'tcx>) {
    #[instrument(level = "debug", skip(self))]
        let captures = RefCell::new(FxIndexMap::default());