[Issue 20328] [REG 2.089 beta] deprecation message about Nullable.get in isInputRange

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20328

--- Comment #8 from Basile-z <b2.temp at gmx.com> ---
Yeah maybe but in the meantime something has to be done for this message that's
unrelated to the user code, just because an import is there while unit-testing.
We (well I'm not so inside that we..) cant keep this until the end of the
deprecation period.

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