[Issue 9608] Add introspection for templates

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=9608

--- Comment #10 from Andrei Alexandrescu <andrei at erdani.com> ---
It seems https://github.com/D-Programming-Language/phobos/pull/3394 takes care
of this all.

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