$ xcode-select -p /Applications/Xcode.app/Contents/Developer $ xcrun -find swift /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift $ DEVELOPER_DIR=/Library/Developer/CommandLineTools xcrun -find swift /Library/Developer/CommandLineTools/usr/bin/swift $ TOOLCHAINS=org.swift.40320171205 xcrun -find swift /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftTOOLCHAINS環境変数って使えなくなった？$ TOOLCHAINS=org.swift.4020170919 xcrun -find swift /Library/Developer/Toolchains/swift-4.0-RELEASE.xctoolchain/usr/bin/swift $ TOOLCHAINS=org.swift.40220171101a xcrun -find swift /Library/Developer/Toolchains/swift-4.0.2-RELEASE.xctoolchain/usr/bin/swift $ TOOLCHAINS=org.swift.40320171205a xcrun -find swift /Library/Developer/Toolchains/swift-4.0.3-RELEASE.xctoolchain/usr/bin/swift $ TOOLCHAINS=org.swift.4120180329a xcrun -find swift /Library/Developer/Toolchains/swift-4.1-RELEASE.xctoolchain/usr/bin/swift $ TOOLCHAINS=org.swift.41120180502a xcrun -find swift /Library/Developer/Toolchains/swift-4.1.1-RELEASE.xctoolchain/usr/bin/swiftTOOLCHAINS=org.swift.40320171205a ではなく TOOLCHAINS=org.swift.40320171205 って書いてた。