Hello,

Here is a copy-and-paste tutorial about running unittests with optimizations.

https://p0nce.github.io/d-idioms/#Unittests-with-optimizations-:-the-Final-Frontier

This has a number of benefits, in particular this expose DMD codegen bugs more readily. Because organizations may depend on LLVM backend for production, which has more stable codegen, traditionally it can be a bit fruitless to test DMD releases with optimizations on. Hence, DMD codegen bugs gets _avoided_ instead of reported.

Your existing test suite may well be useful to find more DMD codegen bugs and frontend ICE.