https://github.com/apple/swift/pull/12500#discussion_r147789502

[WIP] [IRGen] Improvements to function type metadata by xedin · Pull Request #12500 · apple/swift

Currently only single 'inout' flag has been encoded into function metadata, these changes extend function metadata to support up to 32 flags per parameter.

2:01 AM

↑関数型のmetadata（多分metatypeのこと？)の改善PRとかWIPだし多分これもABI周り

2:02 AM

Conditional conformanceとかもあるか。その条件付きwitness tableをシリアライズしないといかんし