On Monday, 11 March 2024 at 13:16:04 UTC, Alex wrote: > Thanks, it works on Windows to :) > Is it possible pass the compilation flag -O via `dub run`? > Of course: `dub run --build=release` :). The `-O` flag instructs DMD to optimize generated code, and null dereference detection is just a by-product of data flow analysis that DMD performs for some optimizations.