[ ] map, and_then, and or_else members for optionals
[ ] std::unreachable
Pending #323
Pending wide support for C++23 features in a version of clang included in the stable releases of Debian and Ubuntu and Raspbian and macOS (Apple Xcode clang, don't care about Homebrew's clang).
#elifdef
,#elifndef
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2334r1.pdfcontains()
member for stringsstd::unreachable
Pending #323
Pending wide support for C++23 features in a version of clang included in the stable releases of Debian and Ubuntu and Raspbian and macOS (Apple Xcode clang, don't care about Homebrew's clang).