The return type of functions that do not return normally, that is, a type with no values.
SDK
Framework
@frozen enum Never
Use Never as the return type when declaring a closure, function, or method that unconditionally throws an error, traps, or otherwise does not terminate.
func crashAndBurn() -> Never {
fatalError("Something very, very bad happened")
}
var hashValue : IntThe hash value.
func hash(into: inout Hasher)Hashes the essential components of this value by feeding them into the given hasher.
static func != (Never, Never) -> BoolReturns a Boolean value indicating whether two values are not equal.
static func ... (Never) -> PartialRangeFrom<Never> Returns a partial range extending upward from a lower bound.
static func ... (Never) -> PartialRangeThrough<Never> Returns a partial range up to, and including, its upper bound.
static func ... (Never, Never) -> ClosedRange<Never> Returns a closed range that contains both of its bounds.
static func ..< (Never) -> PartialRangeUpTo<Never> Returns a partial range up to, but not including, its upper bound.
static func ..< (Never, Never) -> Range<Never>Returns a half-open range that contains its lower bound but not its upper bound.
static func < (Never, Never) -> BoolReturns a Boolean value indicating whether the value of the first argument is less than that of the second argument.
static func <= (Never, Never) -> BoolReturns a Boolean value indicating whether the value of the first argument is less than or equal to that of the second argument.
static func == (Never, Never) -> BoolReturns a Boolean value indicating whether two values are equal.
static func > (Never, Never) -> BoolReturns a Boolean value indicating whether the value of the first argument is greater than that of the second argument.
static func >= (Never, Never) -> BoolReturns a Boolean value indicating whether the value of the first argument is greater than or equal to that of the second argument.
func fatalError (() -> String, file: StaticString, line: UInt) -> NeverUnconditionally prints a given message and stops execution.