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# Setup alias for `swift`
alias swift="/Applications/Xcode6-Beta2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift"

#Edit - preferred method is above, leaving old method below.

#Xcode 6 Beta 1
sudo xcode-select -switch /Applications/Xcode6-Beta.app/Contents/Developer

#Xcode 6 Beta 2
sudo xcode-select -switch /Applications/Xcode6-Beta2.app/Contents/Developer

xcrun swift 
lldb --repl

#Switch back to current Xcode version
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer