llvm-project

e6521814 - [libc++] Avoid including <format> code in <optional> (#179466)

[libc++] Avoid including <format> code in <optional> (#179466) This patch moves `format_kind` to `<__fwd/format.h>` and moves the mandate of `basic_format_context` into the class body. This reduces the time it takes to parse `<optional>` by ~14%.