[SR-14307] Closure property wrappers crash when applying to blocks #56666
Labels
bug
A deviation from expected or documented behavior. Also: expected but undesirable behavior.
compiler
The Swift compiler in itself
type checker
Area → compiler: Semantic analysis
Comments
|
@swift-ci create |
|
Ah, this code is invalid under the current proposal. You can't pass the backing storage directly to a wrapped parameter, even for closures. If you want to pass @propertyWrapper
public struct Weak<Object: AnyObject> {
public weak var wrappedValue: Object?
public init(wrappedValue: Object?) {
self.wrappedValue = wrappedValue
}
public var projectedValue: Weak<Object> { self }
public init(projectedValue: Weak<Object>) {
self.wrappedValue = projectedValue.wrappedValue
}
}
func withWeakReference<Object: AnyObject>(_ object: Object, _ apply: (Weak<Object>) -> Void) {
let weakRef = Weak(wrappedValue: object)
apply(weakRef)
}
class Foo {
func bar() {
print("bar")
}
}
let f = Foo()
withWeakReference(f) { $obj in
}Or just pass func withWeakReference<Object: AnyObject>(_ object: Object, _ apply: (Object) -> Void) {
apply(object)
}
class Foo {
func bar() {
print("bar")
}
}
let f = Foo()
withWeakReference(f) { (@Weak obj) in
}Note that type inference for closure parameters isn't fully implemented on main yet, but I have it working locally and it'll be part of #36344 |
|
invalid code shouldn't cause the compiler to crash. |
|
I know that. I was letting you know in the meantime what the issue is until I can implement the fix for producing the right error message. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Additional Detail from JIRA
md5: 62ddfd9778fcc39866283ce3b1edcf45
Issue Description:
The following code causes the compiler to crash
The text was updated successfully, but these errors were encountered: