[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 #1 from Basile-z <b2.temp at gmx.com> ---
reproduce without the whole iz library:


---
#!dmd -unittest
module runnable;

void main(string[] args)
{
    import std.json : parseJSON;
    parseJSON("");
}      
---

seems to be used in parseJSON and only when the -unittest switch is also used.

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