Function secp256k1_sys::secp256k1_ec_pubkey_combine

pub unsafe extern "C" fn secp256k1_ec_pubkey_combine(
    cx: *const Context,
    out: *mut PublicKey,
    ins: *const *const PublicKey,
    n: size_t
) -> c_int

Available on non-secp256k1_fuzz only.