Implicitly Unwrapped Optional

Implicitly unwrapped optionals should be avoided when possible.

Non Triggering Examples

@IBOutlet private var label: UILabel!

@IBOutlet var label: UILabel!

@IBOutlet var label: [UILabel!]

if !boolean {}

let int: Int? = 42

let int: Int? = nil

let label: UILabel!

let IBOutlet: UILabel!

let labels: [UILabel!]

var ints: [Int!] = [42, nil, 42]

let label: IBOutlet!

let int: Int! = 42

let int: Int! = nil

var int: Int! = 42

let int: ImplicitlyUnwrappedOptional<Int>

let collection: AnyCollection<Int!>

func foo(int: Int!) {}