    // Test file for Pony syntax highlighting, released under MIT License

    primitive Red   fun apply(): U32 => 0xFFFF0000

    primitive Colours
      fun black(): U32 => 0xFF000000
      fun red(): U32 => 0xFFFF0000

    primitive Black
    primitive Blue

    type Colour is (Black | Blue )

    primitive ColourList
      fun tag apply(): Array[Colour] =>
        [Black; Blue]

    for colour in ColourList().values() do
    end

    type EGLEvent is (U8, F32, F32)
    (var code, var x, var y) = @getEvent[EGLEvent]()

    primitive _XDisplayHandle
    primitive _EGLDisplayHandle

    let x_dpy = @XOpenDisplay[Pointer[_XDisplayHandle]](U32(0))
    if x_dpy.is_null() then
      env.out.print("XOpenDisplay failed")
    end

    let e_dpy = @eglGetDisplay[Pointer[_EGLDisplayHandle]](x_dpy)
    if e_dpy.is_null() then
      env.out.print("eglGetDisplay failed")
    end

    primitive _EGLConfigHandle
    let a = Array[U16](8)
    a.push(0x3040)
    a.push(0b01011)
    let config = Pointer[_EGLConfigHandle]
    if @eglChooseConfig[U32](e_dpy, a, config, U32(1), Pointer[U32]) == 0 then
        env.out.print("eglChooseConfig failed")
    end

    actor Main
      new create(env: Env) =>
        // The no of arguments
        env.out.print(env.args.size().string())
        for value in env.args.values() do
          env.out.print(value)
        end
        // Access the arguments the first one will always be the the appication name
        try env.out.print(env.args(0)?) end

    actor Main
      new create(env: Env) =>
        var options = Options(env)

        options
          .add("output", "o", StringArgument)

        env.out.print(options.has_argument())

        for option in options do
          match option
          | ("output", var arg: String) => _outputFileName = arg.string()
          | let err: ParseError =>
              err.report(env.out)
              env.out.print(
                """
                pony-embed [OPTIONS]
                  --output     name   string output filename.
                """
              )
          end
        end

    use "ponytest"

    actor Main is TestList
      new create(env: Env) => PonyTest(env, this)
      new make() => None

      fun tag tests(test: PonyTest) =>
        test(_TestAddition)

    class iso _TestAddition is UnitTest
      """
      Adding 2 numbers
      """
      fun name(): String => "u32/add"

      fun apply(h: TestHelper): TestResult =>
        h.expect_eq[U32](2 + 2, 4)

    fun tag log(msg: String, verbose: Bool = false)
    be fail() =>
    be assert_failed(msg: String) =>
    fun tag assert_true(actual: Bool, msg: String = "") ?
    fun tag expect_true(actual: Bool, msg: String = ""): Bool
    fun tag expect_eq[A: (Equatable[A] #read & Stringable)]
      (expect: A, actual: A, msg: String = ""): Bool
    fun tag expect_eq[A: (Equatable[A] #unknown & Stringable)]
      (expect: A, actual: A, msg: String = ""): Bool

    fun add(other: A): A
    fun sub(other: A): A
    fun mul(other: A): A
    fun div(other: A): A
    fun mod(other: A): A
    fun eq(other: A): Bool
    fun ne(other: A): Bool
    fun lt(other: A): Bool
    fun le(other: A): Bool
    fun ge(other: A): Bool
    fun gt(other: A): Bool
    fun shl(other: A): A
    fun shr(other: A): A
    fun op_and(other:A): A
    fun op_or(other: A): A
    fun op_xor(othr: A): A

    class Test
      fun alpha() =>
        """
        """

    let dice: Array[U32] = [1; 2; 3
      4
      5
      6
    ]

    actor Main
      fun foo(n:U32): {ref(U32): U32} =>
        var s: Array[U32] = Array[U32].init(n, 1)
        {ref(i:U32)(s): U32 =>
          try
            s(0) = s(0) + i
            s(0)
          else
            0
          end
        }

      new create(env:Env) =>
        var f = foo(5)
        env.out.print(f(10).string())
        env.out.print(f(20).string())

    /* nested /* commentary */ */
    // single comment

    class A
    class _A
    x'
    x''
    x'.string()
    '\uaaaa'
    '\Ubbbbbb'
    '\xcc'
    '\''
    '\n'
    "\uaaaaa"
    "\Ubbbbbbb"
    "\xccc"
    "\""
    "\n"
    34.4
    34.4e43
    43e4
    0x3040
    0xaF
    0b01
    3_43_4
    0x0_4

    fun create(): U32 => 0
    fun iso create(): U32 => 0
    fun \\ abc \\  iso create(): U32 => 0
    class \\ packet, blah \\ iso Xyz
    if \\ likely \\ a then
    end

    a.endnormal

    print();print()

    /* syntactically false: */

    class _aA
    class _a
    class a
    0b2332
    0b
    0x
    0xgf
    0f00
    3.
    .3
    3.e3
    3_
    3__43_4
    ''
    '\u'
    '\ua'
    '\uaaa'
    '\uaaaaa'
    '\uyyyy'
    "\u"
    "\ua"
    "\uaaa"
    "\uyyyy"
    a'a

    class badType
    print();