Interfaces and templates

[JN]

import std.stdio;

interface IWriter
{
     void write(U)(U x);
}

class Foo : IWriter
{
     void write(U)(U x, int y)
     {
         writeln(x);
     }
}



void main()
{
}

Does this code make sense? If so, why doesn't it throw an error 
about unimplemented write (or incorrectly implemented) method?