pub unsafe extern "C" fn secp256k1_ecdsa_sign_recoverable(
    cx: *const Context,
    sig: *mut RecoverableSignature,
    msg32: *const u8,
    sk: *const u8,
    noncefn: Option<unsafe extern "C" fn(_: *mut u8, _: *const u8, _: *const u8, _: *const u8, _: *mut c_void, _: u32) -> i32>,
    noncedata: *const c_void
) -> i32