[Source compatibility suite] GRDB failing to build debug config - error: capture of 'witness' with non-sendable type 'Witness' in a '@Sendable' closure [#sendable-closure-captures]

[justice-adams-apple]

Description

GRDB is failing to build the debug configuration on MacOs with the following error:

GRDB.swift/Tests/GRDBTests/DatabaseAfterNextTransactionCommitTests.swift:53:42: error: capture of 'witness' with non-sendable type 'Witness' in a '@Sendable' closure [#sendable-closure-captures]
 39 |     
 40 |     func assertTransaction_registerBefore(start startSQL: String, end endSQL: String, isNotifiedAs expectedCompletion: Database.TransactionCompletion) throws {
 41 |         class Witness { }
    |               `- note: class 'Witness' does not conform to the 'Sendable' protocol
 42 |         
 43 |         let dbQueue = try makeDatabaseQueue()
    :
 51 |                 db.afterNextTransaction { _ in
 52 |                     // use witness
 53 |                     withExtendedLifetime(witness, { })
    |                                          `- error: capture of 'witness' with non-sendable type 'Witness' in a '@Sendable' closure [#sendable-closure-captures]
 54 |                     commitCountMutex.increment()
 55 |                 }

Reproduction

swift build --disable-sandbox --package-path GRDB.swift --verbose --configuration debug --build-tests -Xswiftc -swift-version -Xswiftc 6 -Xswiftc -enable-testing

Expected behavior

Expected the project to build correctly

Environment

Apple Swift version 6.2-dev (LLVM de6bfa2f4bd7aac, Swift 80050bb)
Target: x86_64-apple-macosx10.15

Additional information

https://ci.swift.org/job/swift-main-source-compat-suite-debug/1052