Templates problem

[pineapple via Digitalmars-d-learn]

On Tuesday, 6 September 2016 at 14:38:54 UTC, Russel Winder wrote:
> and I have no idea just now why it is complaining, nor what to 
> do to fix it.

You might want to check out the ranges package of the library I'm 
working on.

https://github.com/pineapplemachine/mach.d/tree/master/mach/range

This topic motivated me to see if my map function worked with 
static arrays. Turns out that somehow I'd neglected to include a 
unit test, and it in fact failed.

Once I've had a chance to commit the couple-line fix, probably in 
a couple hours, this will be a valid program:

     import mach.range : map;
     import std.stdio : writeln;

     void main(){
         const(const(int)[3]) array = [1, 2, 3];
         auto mapped = array.map!(e => e + 1);
         mapped.front.writeln; // 2
         mapped[0].writeln; // 2
         // etc.
     }