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// RUN: %target-swift-frontend -swift-version 4 -emit-sil -verify %s | %FileCheck %s
do {
func a(_ x: @autoclosure () -> Int) {}
func b(_ x: Int, _ f: @autoclosure () -> Int = #line) {}
func c(_ y: @autoclosure () -> Int, _ z: Int) {
// CHECK: function_ref @$s16attr_autoclosure1aL_yySiyXKF
a(y)
// CHECK: function_ref @$s16attr_autoclosure1cL_yySiyXK_SitFSiyXEfu_
b(z + 42) // ok
b(z, y) // ok to pass `@autoclosure` function type as an argument
b(z, y()) // ok
}
}
func foo(_ f: @autoclosure () -> Int) {}
func foo(_ f: () -> Int) {}
do {
func bar(_ a: @autoclosure () -> Int,
_ b: () -> Int,
_ c: Int) {
// CHECK: function_ref @$s16attr_autoclosure3fooyySiyXEF
foo(a)
// CHECK: function_ref @$s16attr_autoclosure3fooyySiyXEF
foo(b)
// CHECK: function_ref @$s16attr_autoclosure3fooyySiyXKF
foo(a())
// CHECK: function_ref @$s16attr_autoclosure3fooyySiyXKF
foo(b())
// CHECK: function_ref @$s16attr_autoclosure3fooyySiyXKF
foo(c)
}
}
func passAutoClosureToSubscriptAndMember(_ fn: @autoclosure () -> Int) {
struct S {
func bar(_: Int, _ fun: @autoclosure () -> Int) {}
subscript(_ fn: @autoclosure () -> Int) -> Int { return fn() }
static func foo(_: @autoclosure () -> Int) {}
}
let s = S()
let _ = s.bar(42, fn) // Ok
let _ = s[fn] // Ok
let _ = S.foo(fn) // Ok
}
func passAutoClosureToEnumCase(_ fn: @escaping @autoclosure () -> Int) {
enum E {
case baz(@autoclosure () -> Int)
}
let _: E = .baz(42) // Ok
// FIXME: This line type-checks correctly but causes a crash
// somewhere SILGen if `fn` doesn't have `@escaping`.
let _: E = .baz(fn) // Ok
}
do {
func bar(_ fn: @autoclosure () -> (() -> Int)) {}
func foo(_ fn: @autoclosure @escaping () -> (() -> Int)) {
bar(fn) // Ok
}
}
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