[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 #2 from Basile-z <b2.temp at gmx.com> ---
well just 

    $ dmd -unittest typecons.d 

shows the deprecation

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