[Issue 16577] deduplicate deprecation messages

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16577

Martin Nowak <code at dawg.eu> changed:

           What    |Removed                     |Added
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                 CC|                            |code at dawg.eu
           Severity|minor                       |enhancement

--- Comment #2 from Martin Nowak <code at dawg.eu> ---
Would be fairly simple to deduplicate deprecation messages when triggering
them, not sure about the memory requirements (prolly not much) or other
strategies to avoid emitting the same message.
We should only deduplicate messages occuring at the same source location, so
that it remains possible to fix all of them in one go.

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