swift-mirror/test/Parse/errors.swift

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

enum MSV : _ErrorType {
  case Foo, Bar, Baz
  case CarriesInt(Int)

  var domain: String { return "" }
  var code: Int { return 0 }
}

func opaque_error() -> _ErrorType { return MSV.Foo }

func one() {
  do {
    true ? () : throw opaque_error() // expected-error {{expected expression after '? ... :' in ternary expression}}
  } catch _ {
  }

  do {
    
  } catch { // expected-warning {{'catch' block is unreachable because no errors are thrown in 'do' block}}
    let error2 = error
  }

  do {
  } catch where true { // expected-warning {{'catch' block is unreachable because no errors are thrown in 'do' block}}
    let error2 = error
  } catch {
  }
}

func takesAutoclosure(@autoclosure fn : () -> Int) {}
func takesThrowingAutoclosure(@autoclosure fn : () throws -> Int) {}

func genError() throws -> Int { throw MSV.Foo }
func genNoError() -> Int { return 0 }

func testAutoclosures() throws {
  takesAutoclosure(genError()) // expected-error {{call can throw, but it is not marked with 'try' and it is executed in a non-throwing autoclosure}}
  takesAutoclosure(genNoError())

  try takesAutoclosure(genError()) // expected-error {{call can throw, but it is executed in a non-throwing autoclosure}}
  try takesAutoclosure(genNoError()) // expected-warning {{no calls to throwing functions occur within 'try' expression}}

  takesAutoclosure(try genError()) // expected-error {{call can throw, but it is executed in a non-throwing autoclosure}}
  takesAutoclosure(try genNoError()) // expected-warning {{no calls to throwing functions occur within 'try' expression}}

  takesThrowingAutoclosure(try genError())
  takesThrowingAutoclosure(try genNoError()) // expected-warning {{no calls to throwing functions occur within 'try' expression}}

  try takesThrowingAutoclosure(genError())
  try takesThrowingAutoclosure(genNoError()) // expected-warning {{no calls to throwing functions occur within 'try' expression}}

  takesThrowingAutoclosure(genError()) // expected-error {{call can throw but is not marked with 'try'}}
  takesThrowingAutoclosure(genNoError())
}

struct IllegalContext {
  var x: Int = genError() // expected-error {{call can throw, but errors cannot be thrown out of a property initializer}}

  func foo(x: Int = genError()) {} // expected-error {{call can throw, but errors cannot be thrown out of a default argument}}

  func catcher() throws {
    do {
      try genError()
    } catch MSV.CarriesInt(genError()) { // expected-error {{call can throw, but errors cannot be thrown out of a catch pattern}}
    } catch MSV.CarriesInt(let i) where i == genError() { // expected-error {{call can throw, but errors cannot be thrown out of a catch guard expression}}
    }
  }
}

func illformed() throws {
    do {
      try genError()

    // TODO: this recovery is terrible
    } catch MSV.CarriesInt(let i) where i == genError()) { // expected-error {{call can throw, but errors cannot be thrown out of a catch guard expression}} expected-error {{expected '{'}} expected-error {{braced block of statements is an unused closure}} expected-error {{type of expression is ambiguous without more context}}
    }
}