swift-mirror/test/ClangImporter/enum-exhaustivity-system.swift

// RUN: %target-swift-frontend -typecheck %s -Xcc -isystem -Xcc %S/Inputs/custom-modules -verify -swift-version 5 -verify-additional-prefix swift5-
// RUN: %target-swift-frontend -typecheck %s -Xcc -isystem -Xcc %S/Inputs/custom-modules -verify -swift-version 6 -verify-additional-prefix swift6-

import EnumExhaustivity

func test(_ value: RegularEnum, _ exhaustiveValue: ExhaustiveEnum) {
  switch value {
  // expected-swift5-warning@-1 {{switch covers known cases, but 'RegularEnum' may have additional unknown values, possibly added in future versions}}
  // expected-swift6-error@-2 {{switch covers known cases, but 'RegularEnum' may have additional unknown values, possibly added in future versions}}
  // expected-note@-3 {{handle unknown values using "@unknown default"}}
  case .A: break
  case .B: break
  }

  switch exhaustiveValue { // always okay
  case .A: break
  case .B: break
  }
}

func testAttributes(
  _ rete: RegularEnumTurnedExhaustive,
  _ arete: AnotherRegularEnumTurnedExhaustive,
  _ retetb: RegularEnumTurnedExhaustiveThenBackViaAPINotes,
  _ fdte: ForwardDeclaredTurnedExhaustive,
  _ fdo: ForwardDeclaredOnly
) {
  switch rete {
  case .A, .B: break
  }

  switch arete {
  case .A, .B: break
  }

  switch retetb {
  // expected-swift5-warning@-1 {{switch covers known cases, but 'RegularEnumTurnedExhaustiveThenBackViaAPINotes' may have additional unknown values, possibly added in future versions}}
  // expected-swift6-error@-2 {{switch covers known cases, but 'RegularEnumTurnedExhaustiveThenBackViaAPINotes' may have additional unknown values, possibly added in future versions}}
  // expected-note@-3 {{handle unknown values using "@unknown default"}}

  case .A, .B: break
  }

  switch fdte {
  case .A, .B: break
  }

  switch fdo {
  case .A, .B: break
  }
}

func testUnavailableCases(_ value: UnavailableCases) {
  switch value { // okay
  case .A: break
  case .B: break
  }
}