{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"|tcx,"}]}
        |tcx, cv| const_eval::valtree_to_const_value(tcx, ty::TypingEnv::fully_monomorphized(), cv);
    providers.valtree_to_const_val =
    providers.check_validity_requirement = |tcx, (init_kind, param_env_and_ty)| {