{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":")"}]}
) -> Result<(ty::Binder<I, AsyncCallableRelevantTypes<I>>, Vec<I::Predicate>), NoSolution> {
    bound_sig: ty::Binder<I, ty::FnSig<I>>,
    let sig = bound_sig.skip_binder();