[Issue 22279] std.typecons.Tuple.toString calls get on null Nullable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22279

--- Comment #1 from Jack Stouffer <jack at jackstouffer.com> ---
Just realized the root cause of this is the alias this. This should be
deprecated and removed.

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