A patchwork of Clang patches

Clang 20 was released in early March. But there is no rest for the wicked; Clang 21 is poised for a release in September. While we are hard at work on C++23, C++26, and C23 features, I am also trying to find some time to work on miscellaneous bits and bobs. I figured I should talk about some of them even if it&rsquo;s all listed in the in-progress changelog, which we do our best to keep as…