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// RUN: %target-typecheck-verify-swift
// REQUIRES: concurrency
@available(SwiftStdlib 5.5, *)
func doAsynchronously() async { }
@available(SwiftStdlib 5.5, *)
func doSynchronously() { }
@available(SwiftStdlib 5.5, *)
func testConversions() async {
let _: () -> Void = doAsynchronously // expected-error{{invalid conversion from 'async' function of type '() async -> ()' to synchronous function type '() -> Void'}}
let _: () async -> Void = doSynchronously // okay
}
// Overloading
@available(SwiftStdlib 5.5, *)
@available(swift, deprecated: 4.0, message: "synchronous is no fun")
func overloadedSame(_: Int = 0) -> String { "synchronous" }
@available(SwiftStdlib 5.5, *)
func overloadedSame() async -> String { "asynchronous" }
@available(SwiftStdlib 5.5, *)
func overloaded() -> String { "synchronous" }
@available(SwiftStdlib 5.5, *)
func overloaded() async -> Double { 3.14159 }
@available(SwiftStdlib 5.5, *)
@available(swift, deprecated: 4.0, message: "synchronous is no fun")
func overloadedOptDifference() -> String { "synchronous" }
@available(SwiftStdlib 5.5, *)
func overloadedOptDifference() async -> String? { nil }
@available(SwiftStdlib 5.5, *)
func testOverloadedSync() {
_ = overloadedSame() // expected-warning{{synchronous is no fun}}
let _: String? = overloadedOptDifference() // expected-warning{{synchronous is no fun}}
let _ = overloaded()
let fn = {
overloaded()
}
let _: Int = fn // expected-error{{value of type '() -> String'}}
let fn2 = {
print("fn2")
_ = overloaded()
}
let _: Int = fn2 // expected-error{{value of type '() -> ()'}}
let fn3 = {
await overloaded()
}
let _: Int = fn3 // expected-error{{value of type '() async -> Double'}}
let fn4 = {
print("fn2")
_ = await overloaded()
}
let _: Int = fn4 // expected-error{{value of type '() async -> ()'}}
}
@available(SwiftStdlib 5.5, *)
func testOverloadedAsync() async {
_ = await overloadedSame() // no warning
let _: String? = await overloadedOptDifference() // no warning
let _ = await overloaded()
let _ = overloaded()
// expected-error@-1:11{{expression is 'async' but is not marked with 'await'}}{{11-11=await }}
// expected-note@-2:11{{call is 'async'}}
let fn = {
overloaded()
}
let _: Int = fn // expected-error{{value of type '() -> String'}}
let fn2 = {
print("fn2")
_ = overloaded()
}
let _: Int = fn2 // expected-error{{value of type '() -> ()'}}
let fn3 = {
await overloaded()
}
let _: Int = fn3 // expected-error{{value of type '() async -> Double'}}
let fn4 = {
print("fn2")
_ = await overloaded()
}
let _: Int = fn4 // expected-error{{value of type '() async -> ()'}}
}
@available(SwiftStdlib 5.5, *)
func takesAsyncClosure(_ closure: () async -> String) -> Int { 0 }
@available(SwiftStdlib 5.5, *)
func takesAsyncClosure(_ closure: () -> String) -> String { "" }
@available(SwiftStdlib 5.5, *)
func testPassAsyncClosure() {
let a = takesAsyncClosure { await overloadedSame() }
let _: Double = a // expected-error{{convert value of type 'Int'}}
let b = takesAsyncClosure { overloadedSame() } // expected-warning{{synchronous is no fun}}
let _: Double = b // expected-error{{convert value of type 'String'}}
}
@available(SwiftStdlib 5.5, *)
struct FunctionTypes {
var syncNonThrowing: () -> Void
var syncThrowing: () throws -> Void
var asyncNonThrowing: () async -> Void
var asyncThrowing: () async throws -> Void
mutating func demonstrateConversions() {
// Okay to add 'async' and/or 'throws'
asyncNonThrowing = syncNonThrowing
asyncThrowing = syncThrowing
syncThrowing = syncNonThrowing
asyncThrowing = asyncNonThrowing
// Error to remove 'async' or 'throws'
syncNonThrowing = asyncNonThrowing // expected-error{{invalid conversion}}
syncThrowing = asyncThrowing // expected-error{{invalid conversion}}
syncNonThrowing = syncThrowing // expected-error{{invalid conversion}}
asyncNonThrowing = syncThrowing // expected-error{{invalid conversion}}
}
}
// Overloading when there is conversion from sync to async.
@available(SwiftStdlib 5.5, *)
func bar(_ f: (Int) -> Int) -> Int {
return f(2)
}
@available(SwiftStdlib 5.5, *)
func bar(_ f: (Int) async -> Int) async -> Int {
return await f(2)
}
@available(SwiftStdlib 5.5, *)
func incrementSync(_ x: Int) -> Int {
return x + 1
}
@available(SwiftStdlib 5.5, *)
func incrementAsync(_ x: Int) async -> Int {
return x + 1
}
@available(SwiftStdlib 5.5, *)
func testAsyncWithConversions() async {
_ = bar(incrementSync)
_ = bar { -$0 }
_ = bar(incrementAsync)
// expected-error@-1:7{{expression is 'async' but is not marked with 'await'}}{{7-7=await }}
// expected-note@-2:7{{call is 'async'}}
}
// rdar://88692889 - make sure overload resolution cues off the presence of
// 'await' in the body to determine whether to prefer async functions, not
// whether the closure is in a context where it will be converted to async.
@available(SwiftStdlib 5.1, *)
struct OverloadInImplicitAsyncClosure {
init(int: Int) async throws {
let task = Task { () -> Self in
let result = try Self(int: int)
return result
}
self = try await task.value
}
init(int: Int) throws { }
}
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