test/expr/cast/array_iteration.swift

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

func doFoo() {}

class View {
  var subviews: Array<AnyObject>! = []
}

var rootView = View()
var v = [View(), View()]
rootView.subviews = v

_ = rootView.subviews as! [View]

for view in rootView.subviews as! [View] { // expected-warning{{immutable value 'view' was never used; consider replacing with '_' or removing it}}
  doFoo()
}

// FIXME: Diagnostic below should be "'AnyObject' is not convertible to
// 'View'", but IUO type gets in the way of proper diagnosis.
for view:View in rootView.subviews { // expected-error{{type 'Array<AnyObject>?' does not conform to protocol 'Sequence'}}
  doFoo()
}

_ = (rootView.subviews!) as! [View]

_ = (rootView.subviews) as! [View]

var ao: [AnyObject] = []
_ = ao as! [View] // works


var b = Array<(String, Int)>()

for x in b { // expected-warning{{immutable value 'x' was never used; consider replacing with '_' or removing it}}
  doFoo()
}

var c : Array<(String, Int)>! = Array()

for x in c { // expected-warning{{immutable value 'x' was never used; consider replacing with '_' or removing it}}
  doFoo()
}

var d : Array<(String, Int)>? = Array()

for x in d! { // expected-warning{{immutable value 'x' was never used; consider replacing with '_' or removing it}}
  doFoo()
}