Phobos: __FILE__ as template default parameter

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On Tuesday, 21 June 2016 at 02:59:44 UTC, ZombineDev wrote:
> I think it would be good idea to take this even further:
>
> T4 foo(T4, T0, T1, Ts..., T2, T3)(T0 t0, T1 t1, Args args, T2 
> t2, T3 t3)
>
> In other words, I think that the limitation that variadic 
> template parameter list must be at the end of the function 
> parameters is arbitrary and just a deficiency of the current 
> implementation.

I don't disagree with you, but this is a separate issue. If the 
arguments trailing Args have default values (as they would in the 
case of __FILE__, __LINE__) it will create ambiguity.

void foo(Args...)(Args args, int n = 1);

What happens if I do this? foo(1, 2, 3, 4); Is n 1 or 4?