Frustrated with dmd codegen bug

[Basile B.]

On Tuesday, 24 April 2018 at 18:53:02 UTC, H. S. Teoh wrote:
> Yesterday afternoon I ran into a performance issue in one of my 
> D projects, and thought, "well, it's simple, just compile with 
> -profile, identify the hotspot, optimize".  Unfortunately, 
> doing that triggered a latent codegen bug in -O that randomly 
> causes runtime segfaults, basically halting all progress.  I 
> spent all morning today to reduce the code in order to identify 
> the codegen bug:
>
> 	https://issues.dlang.org/show_bug.cgi?id=18794

In the report you forgot to mention that the bug is only visible 
with -O -profile.
With just -O the provided test case works fine.