[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 #3 from Basile-z <b2.temp at gmx.com> ---
It seems to be triggered by the fix for Issue 19799.
Suggestion add version(none) or extract this test from the Type to the global
scope. It's not recommended to add unittest blocks in a templatized type
anyway.

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