Compilation error for generic NSObject: Required init

[vgritsenko]

Commit hash: 0dd772b

Context:
While testing swiftly's support of existing Swift code, noticed that a code using generic NSObject (or NSObject subclass) is not compiling. The same code is compiling just fine in Xcode, is it because Foundation library in Xcode treats NSObject as having a required init?

import Foundation

protocol Test: NSObject /* or an NSObject subclass */ { }

func test<T: Test>() -> T {
    return T()
}

Results in the following compilation error:

.../Sample.swift:21:12: error: constructing an object of class type 'T' with a metatype value must use a 'required' initializer
19 | 
20 | func test<T: Test>() -> T {
21 |     return T()
   |            `- error: constructing an object of class type 'T' with a metatype value must use a 'required' initializer
22 | }
23 | 

Foundation.NSObject.init:2:8: note: selected non-required initializer 'init()'
1 | class NSObject {
2 | public init()}
  |        `- note: selected non-required initializer 'init()'

Environment: Swift 6.3.3 on macOS.

$ swiftly run swift --version
Apple Swift version 6.3.3 (swift-6.3.3-RELEASE)
Target: arm64-apple-macosx26.0

$ uname -a
Darwin it-C01241 25.6.0 Darwin Kernel Version 25.6.0: Sat Jul 11 15:26:21 PDT 2026; root:xnu-12377.161.13~4/RELEASE_ARM64_T6000 arm64