[Issue 18703] Ddoc Backticks inside macro dont work.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18703

--- Comment #2 from ArturG <var.spool.mail700 at gmail.com> ---
this might be the same/similar issue:

    $(DDOC_EXAMPLES
        ---
        void fun(int){} // highlighted
        $(FUN) // expanded but not highlighted
        ---
     )
MACROS:
    FUN = void fun(int){}

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