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[SR-11273] Unexpected behaviour of as? operator with Any and Optional<Any> #53674

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swift-ci opened this issue Aug 8, 2019 · 1 comment
Open

[SR-11273] Unexpected behaviour of as? operator with Any and Optional<Any> #53674

swift-ci opened this issue Aug 8, 2019 · 1 comment
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@swift-ci
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swift-ci commented Aug 8, 2019

Previous ID SR-11273
Radar None
Original Reporter Crescenzio (JIRA User)
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: 717afe7ddeedc959012564e404e0facf

Issue Description:

When an `Optional<Any>` is saved in an `Any` variable, trying to cast the the object to a protocol fails, even if the actual object is a class that conforms to that protocol.

protocol Model {} 
class ModelImpl: Model {}

let test: Any = ModelImpl() as Any? // I received from a library my object as Any but wrapped in an Optional<Any>   

let cast = test as? Model // this returns nil 
let cast2 = test as? ModelImpl // this returns an actual object

Not sure if this is a bug or an expected behaviour, but it's a bit confusing.
@belkadan
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@jckarter, we have a dup for this, right?

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@belkadan @swift-ci