Internal Compiler Error Help

[Andrea Fontana via Digitalmars-d-learn]

https://github.com/CyberShadow/DustMite/wiki

On Thursday, 21 May 2015 at 08:28:30 UTC, Saurabh Das wrote:
> Hello,
>
> We have been working on a genetic programming project, and 
> occasionally the compiler fails and gives an internal error. 
> I've captured and reduced one of these down to a single 
> expression. See http://dpaste.dzfl.pl/e7a66aa067ab 
> (reduced_expr.d)
>
> When I compile this file using: dmd -c -O reduced_expr.d
>
> It says:
> DMD 2.066.1] Internal error: backend/cod1.c 1562
> DMD 2.067.1] Internal error: backend/cod1.c 1567
>
> The compile succeeds without the '-O' flag.
>
> Am I correct in assuming that an internal error in the compiler 
> should be filed as a bug report?
>
> As you can see, the expression is a massive ugly thing, as is 
> often the case with genetic programming. I'd like to reduce 
> this expression further before filing said bug report. I recall 
> seeing a project on this forum which automatically figures out 
> the simplest program which causes a compile failure. Can 
> someone kindly point me to it?
>
> Thanks,
> Saurabh