Delegates: Print 0..9

[Timon Gehr via Digitalmars-d-learn]

On 01.12.2016 21:12, Ali Çehreli wrote:
>
>
> This is a common issue with D and some other languages (as I had learned
> during a Dart language presentation, of which Dart does not suffer
> from). All those delegates do close on the same loop variable. You need
> to produce copies of the variable.

This is a common misconception. It's an implementation bug. The 
variables /are/ distinct. It is actually memory corruption. Evidence:

import std.stdio;

void main(){
     int delegate()[] dgs;
     foreach(immutable i;0..10){
         dgs~=()=>i; // i is immutable
     }
     foreach(dg;dgs) writeln(dg()); // yet changes
     dgs=[];
     foreach(i;0..10){
         int j=i; // creating a new variable
         dgs~=()=>j;
     }
     foreach(dg;dgs) writeln(dg()); // does not help
}