Parameter packs cannot return single-element tuples when static and instance method names match.

[JessyCatterwaul]

Description

No response

Reproduction

enum NamedType {
  static func ƒ<each T>() -> (repeat each T) { fatalError() }
  func ƒ<each T>() -> (repeat each T) { fatalError() }
}

These compile:

NamedType.ƒ() as Void
_ = NamedType.ƒ() as (Never, Never)

This does not:

NamedType.ƒ() as Never // Cannot convert value of type '(repeat _)' to type 'Never' in coercion

Renaming one of the functions allows it to compile.

However, this is also a problem with subscripts, where renaming is of course not possible. Replacing the functions with the following will yield identical results.

struct NamedType {
  static subscript<each T>() -> (repeat each T) { fatalError() }
  subscript<each T>() -> (repeat each T) { get { fatalError() } }
}

NamedType[] as Void
_ = NamedType[] as (Never, Never)
NamedType[] as Never // Cannot convert value of type '(repeat _)' to type 'Never' in coercion

Expected behavior

Both overloads are usable.

Environment

swift-driver version: 1.115.1 Apple Swift version 6.0.3 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)
Target: arm64-apple-macosx15.0

Additional information

No response