D rawkz! -- custom writefln formats

[Andrej Mitrovic]

On 1/16/13, H. S. Teoh <hsteoh at quickfur.ath.cx> wrote:
> I'm guessing that most D users don't realize extent of the flexibility
> of std.format

There's a problem:

module test;
import std.stdio;

class C1 { }
class C2 : C1
{
    void toString(scope void delegate(const(char)[]) put)
    {
        put("Subclass");
    }
}

void main()
{
    C1 c = new C2();
    writeln(c);  // writes 'test.C2'
}

I think this might be a problem of having the Object root class
implement toString.