Swifty flags is a reference of all Swift compiler flags per toolchain version. It allows one to lookup which flags are "upcoming" and which ones are "experimental".
Every feature also has a search link to lookup related Swift evolution proposals.
The way it works is by periodically scraping the Swift source repository, looking up all LANGUAGE_FEATURE, EXPERIMENTAL_FEATURE and UPCOMING_FEATURE flags.
Contributions are more than welcome! 🤗