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// RUN: %target-typecheck-verify-swift
func takeIntToInt(_ f: (Int) -> Int) { }
func takeIntIntToInt(_ f: (Int, Int) -> Int) { }
// Simple closures with anonymous arguments
func simple() {
takeIntToInt({
#if true
$0 + 1
#else
$0 + 2
#endif
})
takeIntIntToInt({
#if true
$0 + $1 + 1
#else
$0 + $1 + 2
#endif
})
}
// Anonymous arguments with inference
func myMap<T, U>(_ array: [T], _ f: (T) -> U) -> [U] {}
func testMap(_ array: [Int]) {
var farray = myMap(array, {
#if true
Float($0)
#else
Float($0 + 1)
#endif
})
var _ : Float = farray[0]
let farray2 = myMap(array, { (x : Int) in
#if true
Float(x)
#else
Float(x + 1)
#endif
})
farray = farray2
_ = farray
}
// Nested single-expression closures -- <rdar://problem/20931915>
class NestedSingleExpr {
private var b: Bool = false
private func callClosureA(_ callback: () -> Void) {}
private func callClosureB(_ callback: () -> Void) {}
func call() {
callClosureA { [weak self] in
#if true
self?.callClosureA {
#if true
self?.b = true
#else
self?.b = false
#endif
}
#else
self?.callClosureB {
#if true
self?.b = true
#else
self?.b = false
#endif
}
#endif
}
}
}
// Autoclosure nested inside single-expr closure should get discriminator
// <rdar://problem/22441425> Swift compiler "INTERNAL ERROR: this diagnostic should not be produced"
struct Expectation<T> {}
func expect<T>(_ expression: @autoclosure () -> T) -> Expectation<T> {
return Expectation<T>()
}
func describe(_ closure: () -> ()) {}
func f() {
#if true
describe {
#if false
_ = expect("this")
#else
_ = expect("what")
#endif
}
#endif
}
struct Blob {}
func withBlob(block: (Blob) -> ()) {}
protocol Binding {}
extension Int: Binding {}
extension Double: Binding {}
extension String: Binding {}
extension Blob: Binding {}
struct Stmt {
@discardableResult
func bind(_ values: Binding?...) -> Stmt {
return self
}
@discardableResult
func bind(_ values: [Binding?]) -> Stmt {
return self
}
@discardableResult
func bind(_ values: [String: Binding?]) -> Stmt {
return self
}
}
let stmt = Stmt()
withBlob {
#if true
stmt.bind(1, 2.0, "3", $0)
#endif
}
withBlob {
#if true
stmt.bind([1, 2.0, "3", $0])
#endif
}
withBlob {
#if true
stmt.bind(["1": 1, "2": 2.0, "3": "3", "4": $0])
#endif
}
// <rdar://problem/19840785>
// We shouldn't crash on the call to 'a.dispatch' below.
class A {
func dispatch(_ f : () -> Void) {
f()
}
}
class C {
var prop = 0
var a = A()
func act() {
a.dispatch({() -> Void in
#if true
self.prop // expected-warning {{expression of type 'Int' is unused}}
#endif
})
}
}
// Never-returning expressions
func haltAndCatchFire() -> Never {
#if true
while true { }
#else
while false { }
#endif
}
let backupPlan: () -> Int = {
#if true
haltAndCatchFire()
#endif
}
func missionCritical(storage: () -> String) {}
missionCritical(storage: {
#if true
haltAndCatchFire()
#endif
})
// https://github.com/apple/swift/issues/47540
enum E { }
func takesAnotherUninhabitedType(e: () -> E) {}
takesAnotherUninhabitedType {
#if true
haltAndCatchFire()
#endif
}
// Weak capture bug caught by rdar://problem/67351438
class Y {
var toggle: Bool = false
func doSomething(animated: Bool, completionHandler: (Int, Int) -> Void) { }
}
class X {
private(set) var someY: Y!
func doSomething() {
someY?.doSomething(animated: true, completionHandler: { [weak someY] _, _ in
#if true
someY?.toggle = true
#else
someY?.toggle = false
#endif
})
}
}
var intOrStringClosure_true = {
#if true
42
#else
"foo"
#endif
}
var intOrStringClosure_false = {
#if false
42
#else
"foo"
#endif
}
func testMultiType() {
let a = intOrStringClosure_true()
_ = a as Int
_ = a as String // expected-error {{cannot convert value of type 'Int' to type 'String'}}
let b = intOrStringClosure_false()
_ = b as Int // expected-error {{cannot convert value of type 'String' to type 'Int'}}
_ = b as String
}
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