❯ DYLD_LIBRARY_PATH=/Applications/Xcode_12.5.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx /Applications/Xcode_13_beta.app/Contents/Developer/usr/bin/xctest -XCTest .build/debug/SwiftTypeReaderPackageTests.xctest/2021-06-11 13:40:03.625 xctest[27034:1392524] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSSetM addObject:]: object cannot be nil' *** First throw call stack: ( 0 CoreFoundation 0x00007fff205b287b __exceptionPreprocess + 242 1 libobjc.A.dylib 0x00007fff202ead92 objc_exception_throw + 48 2 CoreFoundation 0x00007fff206682ea _CFThrowFormattedException + 202 3 CoreFoundation 0x00007fff2066f993 -[__NSSetM addObject:].cold.2 + 0 4 CoreFoundation 0x00007fff205168de -[__NSSetM addObject:] + 720 5 XCTest 0x0000000109375314 -[XCTTestIdentifierSetBuilder addTestIdentifier:] + 64 6 xctest 0x0000000109174a84 main + 1963 7 libdyld.dylib 0x00007fff2045af5d start + 1 8 ??? 0x0000000000000003 0x0 + 3 ) libc++abi: terminating with uncaught exception of type NSException [1] 27034 abort DYLD_LIBRARY_PATH= -XCTest .build/debug/SwiftTypeReaderPackageTests.xctest/