File: rdar68155466.swift

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// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -verify %s
// REQUIRES: objc_interop

import Foundation

@objc class A : NSObject {
  func uniqueID() -> Int {
    42
  }
}

// FIXME: the diagnostic below ideally should have been emitted (rdar://106241733)
struct Loop< // note {{required by generic struct 'Loop' where 'ID' = '() -> Int'}}
  Data : RandomAccessCollection,
  ID : Hashable,
  Content
> {
  public init(
    _ data: Data,
    id: KeyPath<Data.Element, ID>,
    content: @escaping (Data.Element) -> Content) {}
}

func data() -> [A] {
  return []
}

_ = Loop(data(), id: \.uniqueID) { $0 } // expected-error {{key path cannot refer to instance method 'uniqueID()'}}
// FIXME: the diagnostics below ideally should have been emitted (rdar://106241733)
// error@-1 {{type '() -> Int' cannot conform to 'Hashable'}} note@-1 {{only concrete types such as structs, enums and classes can conform to protocols}}