Cannot call find with haystack elements having a explicit copy constructors

[Per Nordlöw]

On Thursday, 15 July 2021 at 11:08:25 UTC, Per Nordlöw wrote:
> The adding of copy construtors to `Service` defined as
>
> ```d
> @safe struct Service {
>     this(ref return scope typeof(this) rhs) {}
>     this(const ref return scope typeof(this) rhs) const {}
> }

Using `inout` as

```d
@safe struct Service {
     this(inout ref typeof(this) rhs) inout {}
}
```

works.