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Implement try block expressions#52602

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Aug 23, 2018

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Commits on Aug 19, 2018

• Rename `Catch` variants to `TryBlock`

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• Add `try` to syntax_pos as an edition-2018-only keyword

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• Parse try blocks with the try keyword instead of do catch placeholder

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• Fix the unstable book

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• Put `try` in the reserved list, not the in-use list

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• Suggest `try` if someone uses `do catch`

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• Rename `catch_expr` feature to `try_blocks`

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• Update try-block tests to work under NLL

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Commits on Aug 20, 2018

• Make a try-blocks folder for all the try{} UI tests

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• Switch out another use of `do catch`

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