[Issue 21892] deprecation warning on reflection should be suppressed or at least suppressable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21892

--- Comment #2 from Adam D. Ruppe <destructionator at gmail.com> ---
Those of us who actually use D in the real world have to work around seas of
deprecation messages caused by reflection all the time. It becomes a boy who
cried wolf. It'd help a lot.

And deprecated symbols are not necessarily removed. The whole point of a
deprecation is to say "don't use it". actually removing at that point is
redundant breakage.

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