[Issue 2420] string mixins are not considered in ddoc

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=2420

RazvanN <razvan.nitu1305 at gmail.com> changed:

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                 CC|                            |razvan.nitu1305 at gmail.com

--- Comment #5 from RazvanN <razvan.nitu1305 at gmail.com> ---
As far as I know, ddoc generation is done right after parsing. This means that
by the time the doc is generated the mixin has not been expanded yet.

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