[Issue 17473] foreach on delegates incorrectly rejected

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17473

--- Comment #4 from Vladimir Panteleev <thecybersha...@gmail.com> ---
Adding `ref` to `char a` fixes compilation, but it's still weird that `ref`'s
presence is inconsistently needed.

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