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// RUN: %empty-directory(%t)
// RUN: %target-build-swift -module-name main -I %t -L %t %s -o %t/main %target-rpath(%t)
// RUN: %target-codesign %t/main
// RUN: %target-run %t/main | %FileCheck %s
// REQUIRES: executable_test
@propertyWrapper
struct Wrapper<Value> {
public var value: Value
init(wrappedValue: Value) {
self.value = wrappedValue
}
var projectedValue: Self { return self }
var wrappedValue: Value {
get { self.value }
set { self.value = newValue }
}
func test() -> Int { 42 }
}
extension Wrapper where Value: ExpressibleByNilLiteral {
init() {
self.value = nil
}
}
enum Either<T,U> {
case first(T)
case second(U)
}
@resultBuilder
struct TupleBuilder {
static func buildBlock() -> () { }
static func buildBlock<T1>(_ t1: T1) -> T1 {
return t1
}
static func buildBlock<T1, T2>(_ t1: T1, _ t2: T2) -> (T1, T2) {
return (t1, t2)
}
static func buildBlock<T1, T2, T3>(_ t1: T1, _ t2: T2, _ t3: T3)
-> (T1, T2, T3) {
return (t1, t2, t3)
}
static func buildBlock<T1, T2, T3, T4>(_ t1: T1, _ t2: T2, _ t3: T3, _ t4: T4)
-> (T1, T2, T3, T4) {
return (t1, t2, t3, t4)
}
static func buildBlock<T1, T2, T3, T4, T5>(
_ t1: T1, _ t2: T2, _ t3: T3, _ t4: T4, _ t5: T5
) -> (T1, T2, T3, T4, T5) {
return (t1, t2, t3, t4, t5)
}
static func buildDo<T>(_ value: T) -> T { return value }
static func buildOptional<T>(_ value: T?) -> T? { return value }
static func buildEither<T,U>(first value: T) -> Either<T,U> {
return .first(value)
}
static func buildEither<T,U>(second value: U) -> Either<T,U> {
return .second(value)
}
}
func tuplify<T>(_ cond: Bool, @TupleBuilder body: (Bool) -> T) {
print(body(cond))
}
tuplify(true) { cond in
@Wrapper var x: Int?
x
x = 42
x
}
// CHECK: (nil, (), Optional(42))
tuplify(true) { cond in
@Wrapper var x: Int = 42
x
if cond {
$x
}
}
// CHECK: (42, Optional(main.Wrapper<Swift.Int>(value: 42)))
tuplify(true) { cond in
@Wrapper(wrappedValue: 42) var x: Int
if cond && x == 42 {
x = 30
$x
}
x
}
// CHECK: (Optional(((), main.Wrapper<Swift.Int>(value: 30))), 30)
tuplify(true) { cond in
if cond {
@Wrapper(wrappedValue: 42) var x: Int
if $x.test() > 0 {
x
}
}
""
}
// CHECK: (Optional(Optional(42)), "")
tuplify(true) { cond in
var x: Int?
if cond {
var y: Int?
x = 1
y = x
y
} else {
x = 0
}
x
}
// CHECK: (main.Either<((), (), Swift.Optional<Swift.Int>), ()>.first((), (), Optional(1)), Optional(1))
tuplify(true) { cond in
""
var x: Int {
get { 42 }
}
if cond {
x
}
""
}
// CHECK: ("", Optional(42), "")
tuplify(true) { cond in
lazy var x: Int = {
42
}()
if cond {
x
x = 0
x
}
""
}
// CHECK: (Optional((42, (), 0)), "")
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