{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
    let nonnull_ty = tcx.type_of(nonnull_did).instantiate(tcx, args);
    let unique_ty = tcx.type_of(unique_did).instantiate(tcx, args);
    let ptr_ty = Ty::new_imm_ptr(tcx, pointee);