    /********
    * Highlight testing module.
    *
    * Do not attempt to run this!
    ***********/
    module highlighttest;
    import X = null;

    /++ Pragma directives. DDoc + DDoc embedded items. Special Tokens.
    +
    + ---
    + // comment
    + #line 12 "hightlighttest.d"	/* block comment */
    + #line __LINE__ __FILE__	/++ embedded block comment +/
    +
    + pragma /* */ (msg, "what?");
    + pragma(/++ +/ lib, "insane.a");
    + pragma(inline);
    + pragma(linkerDirective);
    + pragma(mangle);
    + pragma(startaddress);
    + pragma(D_Custom_Extension, "custom data");
    + pragma(foo 0);
    + ---
    +/

    /// version condition
    version = X;
    version = 1_2_3;
    version (X) ;
    version(linux) {}

    /// linkage
    extern
        (C) {}
    extern :
    ;
    extern (C++) {}
    extern (C++, foo.bar.baz) {}
    extern (D) {}
    extern (Windows) {}
    extern (Pascal) {}
    extern (System) {}
    extern (unknown) {}
    extern (C,) {}
    extern (C++, foo, bar) {}

    /// alias & typedef
    alias int.min minint;
    typedef int myint;

    int main(char[][] args) {
        /// statements
        if (1) {}
        else {}
        with (N) {x = B}

        /// attributes
        auto x = 1;
        static if (true) {}
        void (in X, out Y) {}	// NOTE: using in like this is rare, more common to use as an expression and no way to tell apart?

        /// deprecated
        deprecated void fct ();

        /// types
        void a;
        ushort u;
        int[uint] AA;
        class C;
        enum N : int { A = 5, B }
        typeof(u) u2;

        /// expressions
        x = cast(int) 55;
        void* p = null;
        p = cast(void*) new int;
        x = 1 in AA;	// NOTE: a THIRD use of in. How to detect??
        assert (true);

        /// libsymbols
        string s = "";
        throw new Exception;
        TypeInfo ti = typeid(int);

        /// tests
        debug {}
        debug (2) {}
        debug (DSymb) {}
        unittest {}

        /// scope (as attribute and as statement)
        scope struct S;
        scope (exit) {}
        scope
         (success) {}	// NOTE: rules cannot match across new-lines
        scope (failure) {}

        /// Properties
        x = int.min;
        s = (5-3).stringof;

        /// strings
        s = r"raw string";
        s = x"00FF";
        s = \n \a;
        s = \u1234;
        s = \U12345678;
        s = \&amp; ;
        char c = 'a';
        s = "abc 012 \" \n \x12 \u1234 \U12345678";
        s = `BQString '"`;
        s = q{foo "bar" 123};
        s = q"FOO
    foo
    FOO";
        s = q"[foo [bar] q"[baz]"]";
        s = q"(foo (bar) q"(baz)")";
        s = q"<foo <bar> q"<baz>">";
        s = q"{foo {bar} q"{baz}"}";
        s = q"/foo/";
        s = q"!foo!";

        /// region markers
        //BEGIN x
        //END x

        /// DDoc
        /*******
        * DDoc
        *
        * Section:
        * New section.
        * $(I italic)
        *******/
        /+++++++
        + DDoc
        + /+
        + +/
        +++++++/

        // comments
        // FIXME NOTE
        /* comment */
        /+ comment /+ nested comment +/ +/

        /// brace folding
        {
        }

        /** normal text
        * ---
        * .x;
        * ..
        * ...
        * ....
        * .....
        * _._
        * _e1
        * ---
        */

        /// float and int literals
        int i;
        real r;
        ireal ir;
        r = .0;
        r = 0f;
        ir = 0e0i;
        ir = 0.fi;
        r = 0.0e0;
        r = 0xF.Fp0;
        r = 0x_._p0_;
        i = 5;
        i = -1;
        i = 0b10;
        i = 0070;
        i = 00;
        i = 0xF0;

        /// ranges
        int[] A;
        i = A[1];
        A = A[0..$];
        A = A[0..0];
        A = A[0..length];

        /// labels
        label:
        goto label;

        /// function, delegate
        creal function () fp = function creal() { return 0f+0fi; };
        void delegate (in int i, lazy int b) dg = delegate void (int, int) {}

        /// in, out, body
        // NOTE: highlighting in & out as statements here could be difficult
        float F ()
        in {}
        out (result) {}
        body {}

        /// try, catch, finally
        try {
            throw new Exception("oh no... ");
        } catch (Exception e) {
        } finally {
        }

        /// mixin
        mixin("return false;").stringof;

        /// templates
        macro; // what does this do?
        template Tp (T) {
            Tp t;
        }
        Tp!(int) y;
    }