[Issue 13571] Overload of std.range.tee which accepts a functions does not accept structs or classes with opCall

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13571

Vladimir Panteleev <thecybershadow at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |thecybershadow at gmail.com

--- Comment #2 from Vladimir Panteleev <thecybershadow at gmail.com> ---
Probably the simplest way to implement this would be to make `tee` use
`unaryFun`, and, if necessary, add `opCall` support to `unaryFun` instead.

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