How to translate this C++ preprocessor declaration in D?

["Luís]

On Saturday, 25 May 2013 at 00:07:02 UTC, Luís Marques wrote:
> On Saturday, 25 May 2013 at 00:02:50 UTC, Heinz wrote:
>> #define my_id 'asdf'

Ah, sorry, didn't notice the single quotes.