bitwise-borrowable-generics.swift

// RUN: %target-run-simple-swift(-enable-experimental-feature RawLayout)
// REQUIRES: executable_test
// REQUIRES: swift_feature_RawLayout
// UNSUPPORTED: use_os_stdlib
// UNSUPPORTED: back_deployment_runtime
// UNSUPPORTED: CPU=arm64e

import Synchronization

structNC<T>:~Copyable {varx:T}

@_rawLayout(like: T, movesAsLike)
structTest<T>:~Copyable {}

func isBitwiseBorrowable(_ type:any(~Copyable.Type))->Bool{
letmetadataPtr=unsafeBitCast(type,
 to: UnsafePointer<UnsafePointer<UInt>>.self)
letflags=metadataPtr[-1][10]
return flags &0x0110_0000==0
}

func test(_ type:any(~Copyable.Type)){
print("\(isBitwiseBorrowable(type))")
}

protocol P:~Copyable {}

// CHECK: begin
print("begin")

// CHECK-NEXT: true
test(Int.self)
// CHECK-NEXT: true
test(Any.self)
// CHECK-NEXT: true
test(P.self)
// CHECK-NEXT: true
test(NC<Int>.self)
// CHECK-NEXT: true
test(NC<Any>.self)
// CHECK-NEXT: false
test(Test<Int>.self)
// CHECK-NEXT: false
test(Test<Any>.self)