28: Refactoring Engine

• Swift.org blog post on Swift Local Refactoring: https://swift.org/blog/swift-local-refactoring/
• Clang-based refactoring engine: http://lists.llvm.org/pipermail/cfe-dev/2017-June/054286.html
• Adding indexing support to Clangd: http://lists.llvm.org/pipermail/cfe-dev/2017-May/053869.html
• Small PR demonstrating implementing a refactoring action to simplify long number literal format:
  • https://github.com/apple/swift/pull/11711
  • SR-5746: https://bugs.swift.org/browse/SR-5746
• All Swift refactoring actions are defined in https://github.com/apple/swift/blob/master/include/swift/IDE/RefactoringKinds.def
• Ideas for potential refactoring transformations: https://bugs.swift.org/issues/?jql=labels%3DStarterProposal%20AND%20labels%3DRefactoring%20AND%20resolution%3DUnresolved

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