[Issue 17269] formattedWrite of struct with Nullable string fails

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17269

--- Comment #8 from Thibaut CHARLES <cromfr at gmail.com> ---
I already opened a PR for this: https://github.com/dlang/phobos/pull/5797
But it never got merged due to a compiler bug having some interactions with the
bug fix.

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