Passing $ as a function argument

[Neia Neutuladh]

On 10/11/2018 04:36 AM, Dejan Lekic wrote:
> On Thursday, 11 October 2018 at 06:58:08 UTC, Simen Kjærås wrote:
>>
>> unittest {
>>     auto x = fun($); // What does it even mean?
>> }
> 
> After some reading through the whole thread I think his "$ idea" can 
> only be applied to a RandomAccessRange (and similar) where the size can 
> be known...

It already works with a RandomAccessRange:

void main()
{
     auto a = [1, 2, 3, 4];
     auto b = a.map!(x => x + 1);
     writeln(b[$-1]);
}

It's just that the compiler can't reach into the body of another 
function to determine what variable you're talking about to find the 
correct value to pass.