升级到Swift 3.1后尝试使用Vapor工具箱时崩溃了.
原文链接：https://www.f2er.com/swift/320203.htmldyld: lazy symbol binding Failed: Symbol not found: __TTSfq4n_s___TFVSS13CharacterView38_measureExtendedGraphemeClusterForwardfT4fromVVSS17UnicodeScalarView5Index_Si Referenced from: /usr/local/bin/vapor Expected in: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/libswiftCore.dylib dyld: Symbol not found: __TTSfq4n_s___TFVSS13CharacterView38_measureExtendedGraphemeClusterForwardfT4fromVVSS17UnicodeScalarView5Index_Si Referenced from: /usr/local/bin/vapor Expected in: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/libswiftCore.dylib
