{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
            let infcx = self.tcx.infer_ctxt().build(TypingMode::non_body_analysis());
        fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx, AmbigArg>) {
            let ocx = ObligationCtxt::new_with_diagnostics(&infcx);