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Comments (3)

paiv avatar paiv commented on August 17, 2024

Current workaround is to move typealias outside the protocol.

from mockingbird.

andrewchang-bird avatar andrewchang-bird commented on August 17, 2024

Thanks for reporting! Definitely seems like an issue with how the type qualifier handles scoping as you indicated.

from mockingbird.

andrewchang-bird avatar andrewchang-bird commented on August 17, 2024

Investigating this brings up some unexpected interactions with Swift’s type inference system, filed under https://bugs.swift.org/browse/TF-1279

protocol One {
  typealias Nominal = String
  typealias Generic<T> = Array<T>
}

class Two: One {
  typealias Nominal = Int
  typealias Generic<T> = Dictionary<String, T>
  
  func method(nominal: Nominal) {}
  func method(oneNominal: One.Nominal) {}
  func method(twoNominal: Two.Nominal) {} // Ambiguous type name 'Nominal' in 'Two'
  
  func method(generic: Generic<Bool>) {}
  func method(oneGeneric: One.Generic<Bool>) {} // Type alias 'Generic' can only be used with a concrete type or generic parameter base
  func method(twoGeneric: Two.Generic<Bool>) {} // Ambiguous type name 'Generic' in 'Two'
}

from mockingbird.

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