Who contributed to Mobile platforms on May 31, 2026?

3 developers shipped this update, including tshortli, nkcsgexi, and cypressious.

What were the notable Mobile platforms updates?

Sema: Infer availability for property wrapper projection variables, Sema: Offer fix-its for useless conditional statements, and ASTMangler: honor @_preInverseGenerics in mangleAnyDecl to match mangleEntity.

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The Wire · Showcase

SWIFT FIXES AVAILABILITY CRASHES, KOTLIN CLEANS UP TYPE CHECKING

By RepoJournal · Filed 06:04 UTC on May 31, 2026 · About Mobile platforms

3 people shipped this

tshortli @tshortli 3 cited

nkcsgexi @nkcsgexi 1 cited

cypressious @cypressious 1 cited

Swift's compiler is plugging a hole where property wrapper projections could crash back-deployed apps, while Kotlin's type system gets a major cleanup across the FIR pipeline.

Swift shipped three critical compiler fixes overnight that touch the foundation of what gets compiled. The biggest: property wrapper projections weren't inheriting availability annotations from their wrapped properties [1], which means back-deployed code referencing those projections could hit missing symbols at runtime. This one's a real gotcha for library authors. Meanwhile, the sema checker now offers fix-its for unreachable conditionals [2], automatically stripping dead code and dedenting the branches that should survive. That's the kind of quality-of-life improvement that compounds across a codebase. Swift also fixed ABI mangling for declarations using @_preInverseGenerics with ~Copyable/~Escapable constraints [3], stopping false positives in swift-api-digester. On the Kotlin side, the FIR compiler pipeline got a significant cleanup [5], removing the SUBTYPING_BETWEEN_CONTEXT_RECEIVERS constraint and rewriting suspicious pattern matches over ConeKotlinType [6]. This is infrastructure work that should quiet down noisy diagnostics and make the type checker more predictable. One Swift PR had to be reverted because it broke testing [4], so watch for that if you're tracking nightlies.

Action items

→ If you maintain libraries with property wrappers, test projections against older deployment targets apple/swift [plan]
→ Monitor the Swift reverted trap-source-location PR to know when it lands safely apple/swift [monitor]
→ Update Kotlin compiler if you're hitting false SuspiciousWhenOverConeKotlinType warnings JetBrains/kotlin [plan]

References

[1] Sema: Infer availability for property wrapper projection variables ↗ apple/swift
[2] Sema: Offer fix-its for useless conditional statements ↗ apple/swift
[3] ASTMangler: honor @_preInverseGenerics in mangleAnyDecl to match mangleEntity ↗ apple/swift
[4] Revert "Merge pull request #89436 from hnrklssn/swiftify-trap-source-location" ↗ apple/swift
[5] [FIR] Remove SUBTYPING_BETWEEN_CONTEXT_RECEIVERS JetBrains/kotlin
[6] Check for suspicious whens over ConeKotlinType KT-86547 ↗ JetBrains/kotlin

Quick answers

What shipped in Mobile platforms on May 31, 2026?: Swift's compiler is plugging a hole where property wrapper projections could crash back-deployed apps, while Kotlin's type system gets a major cleanup across the FIR pipeline. In total, 12 commits and 8 pull requests landed.
Who contributed to Mobile platforms on May 31, 2026?: 3 developers shipped this update, including tshortli, nkcsgexi, and cypressious.
What were the notable Mobile platforms updates?: Sema: Infer availability for property wrapper projection variables, Sema: Offer fix-its for useless conditional statements, and ASTMangler: honor @_preInverseGenerics in mangleAnyDecl to match mangleEntity.

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