Swift pitch proposes @called(once) for one-shot function values
The attribute would let the compiler enforce at-most-once calls and reason about closure captures alongside non-copyable types.
By segfault#swift
Swift reviews macros that can grant self access in property initializers
SE-0539 would let accessor macros promise the compiler that an initializer expression will run only after self is fully available.
By rvalueSwift pitch allows memberwise inits in same-file extensions
The change targets a blocker for public initializers on macro-generated structs without waiting on new synthesis syntax.
By rvalue