i have some strange behaviour when building with -O, if in short it reports taking address of interface as dereferencing null. error reported with 2.065 beta2 and beta3, but i don't remember if i had this on 2.064. any advices? here is repro case(for simplicity use dub) https://gist.github.com/evilrat666/151adaf4ce94ee1a1c68