Re: toString best practices

[Bastiaan Veelo via Digitalmars-d-learn]

On Thursday, 9 February 2023 at 17:49:58 UTC, Paolo Invernizzi 
wrote:
```
import std.format, std.range.primitives;

struct Point(T)
{
    T x, y;
    void toString(W)(ref W writer, scope const ref 
FormatSpec!char f) const
    if (isOutputRange!(W, char))
    {
        put(writer, "(");
        formatValue(writer, x, f);
        put(writer, ", ");
        formatValue(writer, y, f);
        put(writer, ")");
    }
}

void main(){

        import std.format : format;
        assert( format("%s", Point!int(1,2)) == "(1, 2)");

        import std.experimental.logger;
        sharedLog.infof("%s", Point!int(1,2));
}
```

Pasting this into https://run.dlang.io/, it just works. That's 
for DMD 2.099, so it might be a regression -- or recent feature?

-- Bastiaan.