swift-mirror/test/decl/protocol/req/unavailable.swift

// RUN: %target-typecheck-verify-swift

// An @objc protocol can have 'unavailable'
// methods.  They are treated as if they
// were marked optional
@objc protocol Proto {
  @objc @available(*,unavailable) optional func bad()
  func good()
}

class Foo : Proto {
  @objc func good() {}
}

// Reject protocols with 'unavailable' requirements
// if a protocol is not marked @objc.
protocol NonObjCProto {
  @available(*,unavailable) func bad() // expected-error {{protocol members can only be marked unavailable in an @objc protocol}} expected-note {{protocol requires function 'bad()'}}
  func good()
}

class Bar : NonObjCProto { // expected-error {{type 'Bar' does not conform to protocol 'NonObjCProto'}}
  func good() {}
}


// Warn about unavailable witnesses.
protocol P {
  func foo(bar: Foo) // expected-note{{requirement 'foo(bar:)' declared here}}
}

struct ConformsToP : P {
  @available(*, unavailable)
  func foo(bar: Foo) { } // expected-warning{{unavailable instance method 'foo(bar:)' was used to satisfy a requirement of protocol 'P'}}
}