Just writing my first Swift App and got stock on this Swift Compiler Error: "swiftc failed with exit code 11".
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 11
I used Xcode Version 6.3.2 (6D2105) on Yosemite 10.10.3 (14D136).
Solution: Just restart Xcode, seems to be a Xcode compiler bug.
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Swift Compiler Error: swiftc failed with exit code 11