[Issue 16663] [REG 2.072] std.unit.toUpper rejects an alias this to a string

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16663

--- Comment #3 from Dicebot <public at dicebot.lv> ---
Introduced via https://github.com/dlang/phobos/pull/4790

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