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[SR-8154] Inconsistent treating of AnyObject as a protocol #50686

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hamishknight opened this issue Jun 29, 2018 · 3 comments
Open

[SR-8154] Inconsistent treating of AnyObject as a protocol #50686

hamishknight opened this issue Jun 29, 2018 · 3 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself standard library Area: Standard library umbrella

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@hamishknight
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Previous ID SR-8154
Radar None
Original Reporter @hamishknight
Type Bug
Environment

Apple Swift version 4.2 (swiftlang-1000.0.16.7 clang-1000.10.25.3)
Target: x86_64-apple-darwin17.6.0

Additional Detail from JIRA
Votes 0
Component/s Compiler, Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 2cc307df0845ba702863f6b6f8c90bc7

Issue Description:

The documentation for AnyObject currently describes it as:

The protocol to which all classes implicitly conform.

However, technically speaking, AnyObject is no longer a protocol. This fact can be revealed to the user through the invalid inheritance diagnostic:

class C : AnyObject {} // error: Inheritance from non-protocol, non-class type 'AnyObject'

Either the compiler should make AnyObject appear like a protocol to users, or the documentation should be changed to not state that it's a protocol.
@beccadax
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Curiously, “class C: Any {}” is silently permitted without any complaint. It might make sense to do the same for AnyObject.

@hamishknight
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Personally, I agree – I think that class C : AnyObject should just be a warning along with class C : Any (I'm currently working on implementing the latter over at #17425

@belkadan
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belkadan commented Jul 2, 2018

cc @natecook1000

@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 standard library Area: Standard library umbrella
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@belkadan @beccadax @hamishknight