How to say to compiler that I want to inherit final template bethod of base interface into derived class

[anonymous via Digitalmars-d-learn]

import std.stdio;

interface IBase
{
	
	template getStr(string fieldName)
	{
		final string getStr()
		{
			return "George";
		}
	}
	
	
	string getStr(string fieldName);
}


class Derived: IBase
{
	alias getStr = IBase.getStr; /* order matters, see below */
	override string getStr(string fieldName)
	{
		return "Sam";
	}
	/* alias getStr = IBase.getStr; /* doesn't work here, I guess
that's a compiler bug */
}


void main()
{
	auto obj = new Derived;
	
	assert( obj.getStr!("aaa")() == "George" );
	assert( obj.getStr("aaa") == "Sam" );
	
}