Swift opens review of Cell and Volatile interior mutability types
SE-0556 would add Cell, ConstCell, and Volatile primitives, with early debate on naming, library placement, and safety under concurrency and C interop.
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Swift reviews SE-0554 deployment-target conditionals
A proposed #if on minimum OS versions would help shared libraries pick types at compile time, while core engineers call the need a deeper language gap.
By rvalueSwift Crypto 4.5.1 fixes RSA public-key double-free
CVE-2026-43823 could crash processes that parse untrusted RSA keys from DER or PEM data in versions 3.2.0 through 4.5.0.
By rvalueSwiftPM proposes unifying package products and targets
An early design would collapse the two concepts into targets controlled by visibility rules, seeking to reduce manifest confusion while keeping migration paths open.
By segfaultSwift 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 segfaultSwift 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.
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