mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
681d1605af
```swift
class A<T> {
}
class B<U> : A<U> {
}
func test(v: any B<Int> & Sendable) {
_ = v as A // infers `Int` for `A.T`
}
```
217 lines
9.6 KiB
Swift
217 lines
9.6 KiB
Swift
// RUN: %target-typecheck-verify-swift -enable-objc-interop
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// Test the use of 'as' for type coercion (which requires no checking).
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@objc protocol P1 {
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func foo()
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}
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class A : P1 {
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@objc func foo() { }
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}
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@objc class B : A {
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func bar() { }
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}
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func doFoo() {}
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func test_coercion(_ a: A, b: B) {
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// Coercion to a protocol type
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let x = a as P1
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x.foo()
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// Coercion to a superclass type
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let y = b as A
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y.foo()
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}
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class C : B { }
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class D : C { }
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func prefer_coercion(_ c: inout C) {
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let d = c as! D
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c = d
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}
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// Coerce literals
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var i32 = 1 as Int32
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var i8 = -1 as Int8
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// Coerce to a superclass with generic parameter inference
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class C1<T> {
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func f(_ x: T) { }
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}
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class C2<T> : C1<Int> { }
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var c2 = C2<()>()
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var c1 = c2 as C1
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c1.f(5)
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@objc protocol P {}
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class CC : P {}
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let cc: Any = CC()
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if cc is P {
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doFoo()
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}
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if let p = cc as? P {
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doFoo()
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_ = p
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}
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// Test that 'as?' coercion fails.
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let strImplicitOpt: String! = nil
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_ = strImplicitOpt as? String // expected-warning{{conditional downcast from 'String?' to 'String' does nothing}}{{19-30=}}
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class C3 {}
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class C4 : C3 {}
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class C5 {}
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var c: AnyObject = C3()
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// XXX TODO: Constant-folding should generate an error about 'C3' not being convertible to 'C4'
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//if let castX = c as! C4? {}
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// XXX TODO: Only suggest replacing 'as' with 'as!' if it would fix the error.
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C3() as C4 // expected-error {{'C3' is not convertible to 'C4'}}
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// expected-note@-1 {{did you mean to use 'as!' to force downcast?}} {{6-8=as!}}
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C3() as C5 // expected-error {{cannot convert value of type 'C3' to type 'C5' in coercion}}
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// Diagnostic shouldn't include @lvalue in type of c3.
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var c3 = C3()
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// XXX TODO: This should not suggest `as!`
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c3 as C4 // expected-error {{'C3' is not convertible to 'C4'}}
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// expected-note@-1{{did you mean to use 'as!' to force downcast?}} {{4-6=as!}}
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// <rdar://problem/19495142> Various incorrect diagnostics for explicit type conversions
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1 as Double as Float // expected-error{{cannot convert value of type 'Double' to type 'Float' in coercion}}
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1 as Int as String // expected-error{{cannot convert value of type 'Int' to type 'String' in coercion}}
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Double(1) as Double as String // expected-error{{cannot convert value of type 'Double' to type 'String' in coercion}}
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["awd"] as [Int] // expected-error{{cannot convert value of type 'String' to expected element type 'Int'}}
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([1, 2, 1.0], 1) as ([String], Int)
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// expected-error@-1 2 {{cannot convert value of type 'Int' to expected element type 'String'}}
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// expected-error@-2 {{cannot convert value of type 'Double' to expected element type 'String'}}
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[[1]] as [[String]] // expected-error{{cannot convert value of type 'Int' to expected element type 'String'}}
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(1, 1.0) as (Int, Int) // expected-error{{cannot convert value of type '(Int, Double)' to type '(Int, Int)' in coercion}}
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(1.0, 1, "asd") as (String, Int, Float) // expected-error{{cannot convert value of type '(Double, Int, String)' to type '(String, Int, Float)' in coercion}}
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(1, 1.0, "a", [1, 23]) as (Int, Double, String, [String])
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// expected-error@-1 2 {{cannot convert value of type 'Int' to expected element type 'String'}}
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_ = [1] as! [String] // OK
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_ = [(1, (1, 1))] as! [(Int, (String, Int))] // OK
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// <rdar://problem/19495253> Incorrect diagnostic for explicitly casting to the same type
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_ = "hello" as! String // expected-warning{{forced cast of 'String' to same type has no effect}} {{13-24=}}
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// <rdar://problem/19499340> QoI: Nimble as -> as! changes not covered by Fix-Its
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func f(_ x : String) {}
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f("what" as Any as String) // expected-error {{'Any' is not convertible to 'String'}}
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// expected-note@-1{{did you mean to use 'as!' to force downcast?}} {{17-19=as!}}
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f(1 as String) // expected-error{{cannot convert value of type 'Int' to type 'String' in coercion}}
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// <rdar://problem/19650402> Swift compiler segfaults while running the annotation tests
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let s : AnyObject = C3()
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s as C3 // expected-error{{'AnyObject' is not convertible to 'C3'}}
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// expected-note@-1{{did you mean to use 'as!' to force downcast?}} {{3-5=as!}}
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// https://github.com/apple/swift/issues/48579
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protocol P_48579 {}
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do {
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func f1() -> Any {}
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func f2() {}
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@Sendable func f3() {}
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_ = f1 is P_48579 // expected-warning {{cast from '() -> Any' to unrelated type 'any P_48579' always fails}} // expected-note {{did you mean to call 'f1' with '()'?}}{{9-9=()}}
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_ = f1 as! P_48579 // expected-warning {{cast from '() -> Any' to unrelated type 'any P_48579' always fails}} // expected-note {{did you mean to call 'f1' with '()'?}}{{9-9=()}}
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_ = f1 as? P_48579 // expected-warning {{cast from '() -> Any' to unrelated type 'any P_48579' always fails}} // expected-note {{did you mean to call 'f1' with '()'}}{{9-9=()}}
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_ = f2 is P_48579 // expected-warning {{cast from '() -> ()' to unrelated type 'any P_48579' always fails}}
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_ = f2 as! P_48579 // expected-warning {{cast from '() -> ()' to unrelated type 'any P_48579' always fails}}
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_ = f2 as? P_48579 // expected-warning {{cast from '() -> ()' to unrelated type 'any P_48579' always fails}}
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_ = f1 as! AnyObject // expected-warning {{forced cast from '() -> Any' to 'AnyObject' always succeeds; did you mean to use 'as'?}}
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_ = f1 as? AnyObject // expected-warning {{conditional cast from '() -> Any' to 'AnyObject' always succeeds}}
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_ = f2 as! Any // expected-warning {{forced cast from '() -> ()' to 'Any' always succeeds; did you mean to use 'as'?}}
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_ = f2 as? Any // expected-warning {{conditional cast from '() -> ()' to 'Any' always succeeds}}
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func test1<T: P_48579, V: P_48579 & Sendable>(_: T.Type, _: V.Type) {
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_ = f1 is T // expected-warning {{cast from '() -> Any' to unrelated type 'T' always fails}} // expected-note {{did you mean to call 'f1' with '()'?}}{{11-11=()}}
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_ = f1 as! V // expected-warning {{cast from '() -> Any' to unrelated type 'V' always fails}} // expected-note {{did you mean to call 'f1' with '()'?}}{{11-11=()}}
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_ = f1 as? T // expected-warning {{cast from '() -> Any' to unrelated type 'T' always fails}} // expected-note {{did you mean to call 'f1' with '()'?}}{{11-11=()}}
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_ = f2 is T // expected-warning {{cast from '() -> ()' to unrelated type 'T' always fails}}
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_ = f2 as! V // expected-warning {{cast from '() -> ()' to unrelated type 'V' always fails}}
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_ = f2 as? T // expected-warning {{cast from '() -> ()' to unrelated type 'T' always fails}}
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_ = f3 is T // expected-warning {{cast from '@Sendable () -> ()' to unrelated type 'T' always fails}}
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_ = f3 as! V // expected-warning {{cast from '@Sendable () -> ()' to unrelated type 'V' always fails}}
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_ = f3 as? T // expected-warning {{cast from '@Sendable () -> ()' to unrelated type 'T' always fails}}
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}
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func test2<U, S: Sendable>(_: U.Type, _: S.Type) {
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_ = f1 is U // Okay
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_ = f1 as! U // Okay
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_ = f1 as? U // Okay
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_ = f1 is U // Okay
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_ = f2 as! U // Okay
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_ = f2 as? U // Okay
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_ = f2 is S // expected-warning {{cast from '() -> ()' to unrelated type 'S' always fails}}
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_ = f2 as! S // expected-warning {{cast from '() -> ()' to unrelated type 'S' always fails}}
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_ = f2 as? S // expected-warning {{cast from '() -> ()' to unrelated type 'S' always fails}}
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_ = f3 is S // Okay
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_ = f3 as! S // Okay
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_ = f3 as? S // Okay
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}
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}
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// https://github.com/apple/swift/issues/56297
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let any: Any = 1
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if let int = any as Int { // expected-error {{'Any' is not convertible to 'Int'}}
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// expected-note@-1 {{did you mean to use 'as?' to conditionally downcast?}} {{18-20=as?}}
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}
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let _ = any as Int // expected-error {{'Any' is not convertible to 'Int'}}
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// expected-note@-1 {{did you mean to use 'as!' to force downcast?}} {{13-15=as!}}
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let _: Int = any as Int // expected-error {{'Any' is not convertible to 'Int'}}
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// expected-note@-1 {{did you mean to use 'as!' to force downcast?}} {{18-20=as!}}
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let _: Int? = any as Int // expected-error {{'Any' is not convertible to 'Int'}}
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// expected-note@-1 {{did you mean to use 'as?' to conditionally downcast?}} {{19-21=as?}}
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// https://github.com/apple/swift/issues/63926
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do {
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func fn(_: Int) {} // expected-note {{found candidate with type '(Int) -> ()'}}
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// expected-note@-1 {{candidate '(Int) -> ()' has 1 parameter, but context '() -> Void' has 0}}
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func fn(_: Bool) {} // expected-note {{found candidate with type '(Bool) -> ()'}}
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// expected-note@-1 {{candidate '(Bool) -> ()' has 1 parameter, but context '() -> Void' has 0}}
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func fn_1(_: Bool) {}
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let i = 0
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// Missing parameters.
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(fn as (Int, Int) -> Void)(i, i) // expected-error {{cannot convert value of type '(Int) -> ()' to type '(Int, Int) -> Void' in coercion}}
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(fn as (Bool, Bool) -> Void)(i, i) // expected-error {{cannot convert value of type '(Bool) -> ()' to type '(Bool, Bool) -> Void' in coercion}}
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// expected-error@-1 2{{type 'Int' cannot be used as a boolean; test for '!= 0' instead}}
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(fn as (Int, Bool) -> Void)(i, i) // expected-error {{cannot convert value of type '(Int) -> ()' to type '(Int, Bool) -> Void' in coercion}}
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// expected-error@-1 {{type 'Int' cannot be used as a boolean; test for '!= 0' instead}}
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(fn as (String) -> Void)(i) // expected-error {{no exact matches in reference to local function 'fn'}}
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// expected-error@-1 {{cannot convert value of type 'Int' to expected argument type 'String'}}
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// Extraneous parameters.
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(fn as () -> Void)() // expected-error {{no exact matches in reference to local function 'fn'}}
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(fn_1 as () -> Void)() // expected-error {{cannot convert value of type '(Bool) -> ()' to type '() -> Void' in coercion}}
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}
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// Test generic parameter inference through casts
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do {
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class A<T> {
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}
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class B<U> : A<U> {
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}
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func test(v: any B<Int> & Sendable) {
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_ = v as A // infers `Int` for `A.T`
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}
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}
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