The post states > **Note**: Some of what is covered in this post requires bug fixes that first became available in Swift 6.2.3."
AFAIK, some bug fix related with C-interop eg. swift_newtype + (Equatable & import Foundation) cause compiler crash on Linux · Issue #71086 · swiftlang/swift · GitHub is on the unreleased 6.2.4.
Any timeline to include that fix into a new Swift 6.2.4 release? Otherwise some C library which uses swift_newtype will be guarded out. cc @Douglas_Gregor