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constructing an object of class type X with a metatype value must use a 'required' initializer #71874

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Kyle-Ye opened this issue Feb 25, 2024 · 0 comments · May be fixed by apple/swift-corelibs-foundation#4884
Open

constructing an object of class type X with a metatype value must use a 'required' initializer #71874

Kyle-Ye opened this issue Feb 25, 2024 · 0 comments · May be fixed by apple/swift-corelibs-foundation#4884
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. triage needed This issue needs more specific labels

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@Kyle-Ye
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Kyle-Ye commented Feb 25, 2024 •
edited

Description

The following code can compile on Darwin platform but on Linux platform we will get a compiler error.

swift build
Building for debugging...
DemoKit.swift:8:16: error: constructing an object of class type 'Delegate' with a metatype value must use a 'required' initializer
        return Delegate()
               ^~~~~~~~
Foundation.NSObject:2:12: note: selected non-required initializer 'init()'
    public init()
           ^
error: fatalError

Reproduction

Run swift package init to add a new empty package. And then update the main file to the following code.

import Foundation

class Box<Delegate: NSObject> {
    var delegate: NSObject {
        return Delegate()
    }
}

Expected behavior

Compile success on Linux.

Environment

swiftc --version
Swift version 5.9.2 (swift-5.9.2-RELEASE)
Target: aarch64-unknown-linux-gnu

uname -a
Linux ubuntu-2204 6.5.13-orbstack-00122-g57b8027e2387 #1 SMP Tue Feb  6 07:48:26 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux

Additional information

Forums discussion: https://forums.swift.org/t/nsobject-related-compile-issue-on-linux/70266/8
@Kyle-Ye Kyle-Ye added bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. triage needed This issue needs more specific labels labels Feb 25, 2024
This was referenced Feb 25, 2024
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Add required to NSObject Kyle-Ye/swift-corelibs-foundation
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@Kyle-Ye