Enum Exit

tests/all/cli_tests.rs:2851–2856

    #[test]
    fn p2_cli_hostcall_fuel() -> Result<()> {
        enum Exit {
            Ok,
            NoFuel,
            TooManyZeroes,
            BufferTooLarge,
        }

        let dir = tempfile::tempdir()?;
        let file = dir.path().join("1mb");