[Issue 24197] Allow typeof(return) in template constraints

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24197

Bolpat <qs.il.paperinik at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |qs.il.paperinik at gmail.com

--- Comment #1 from Bolpat <qs.il.paperinik at gmail.com> ---
This can be done (in a limited extent) in C++20:
```cpp
#include <concepts>

template<std::integral T>
std::integral auto f(T t)
{
    return t + 1;
}
```

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