Basic question about stderr

[Era Scarecrow via Digitalmars-d-learn]

On Saturday, 21 May 2016 at 21:21:31 UTC, chaseratx wrote:
> I'm learning D and I have a basic question.
>
> I'm trying to write stderr to a file using open() (rather than 
> shell piping/redirection).  It works for stdout but doesn't 
> seem to work with stderr.
>
> http://pastebin.com/KgzR9wAF
>
> stdout is written to the file, but stderr is not and outputs to 
> the shell.  I'm not sure why.  I Googled but couldn't find an 
> answer.  Any hints?

   // <= causes range violation, might use foreach instead
   while (i < numbers.length) {
     write(numbers[i], " ");
     stderr.write(numbers[i]*10); //force stderr, 10x to 
differentiate output

     with (stderr) {              //also force stderr
       write(" ");
     }