nested templates using Complex! with slices, ... confused, I am!

[Paul Backus]

On Monday, 9 August 2021 at 18:35:56 UTC, james.p.leblanc wrote:
>>```d
>>T[] foo_temp(Complex!T[])(T x, T y){
>>   auto r = [x, x];
>>   auto i = [y, y];
>>   auto z = [ Complex!T(x, y), Complex!T(x,y) ];
>>   return z;
>>}
>>```
>>
>>void main(){
>>   auto yd = foo_double(1.1, 2.2);
>>   writeln(yd); ...
>> }
>
> But, no ... I am WRONG!  I get the message:
>
> qqq.d(18): Error: identifier expected for template value 
> parameter

I think what you want is:

```d
Complex!T[] foo_temp(T)(T x, T y) {
   auto r = [x, x];
   auto i = [y, y];
   auto z = [ Complex!T(x, y), Complex!T(x,y) ];
   return z;
}
```

This is what I get when I take one of the non-template versions 
and replace `float` or `double` with `T`.