4 年前のこれと同じですね．swift run -Xlinker -rpath -Xlinker "$(xcode-select -p)/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-6.2/macosx" だと問題なく実行できます． https://forums.swift.org/t/swift-5-5-2-xcode-13-2-beta-fails-to-link-libswift-concurrency-dylib/53263/7

Swift 5.5.2 (Xcode 13.2 beta) fails to link libswift_Concurrency.dylib

For anyone needing this now, and can't wait for a new version of Xcode, this linker path seems to work: swift test --configuration debug -Xlinker -rpath -Xlinker "$(xcode-select -p)/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-5.5/macosx" Note that you may need to add the -Xlinker -rpath -Xlinker "$(xcode-select -p)/Toolchains/XcodeDefault...