Bug 17549 – $($1) should expand to the macro identified by $1

Given a DDoc file: // test.dd // Ddoc $(FOO BAR) Macros: BAR=bar FOO=$($1) ///////////// DMD will currently emit: $(BAR) This result is not what was intended, and not useful. Allowing specifying and expanding macros by their name via macro parameters would allow using new DDoc patterns, similar to the X macro preprocessor pattern in C. Example use case: https://github.com/dlang/dlang.org/pull/1766#discussion_r123892968

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