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[WIP] Property behaviors#23292

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DougGregor wants to merge 10 commits intoswiftlang:masterswiftlang/swift:masterfrom DougGregor:property-behaviors-liteDougGregor/swift:property-behaviors-liteCopy head branch name to clipboard

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Commits on Mar 9, 2019

• [Parse] Parsing and basic AST representation for property behaviors.

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Commits on Mar 14, 2019

• [Type checker] Apply property behavior to the storage type of a variable.

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• [Type checker] Support property behaviors with an init(initialValue:)

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• [Type checker] Implicitly “unwrap” properties with attached behaviors.

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• [Property behaviors] Suppress “unwrapping” of behaviors with a prefix ^.

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• [Property behaviors] Allow property behaviors on member properties.

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• [Property behaviors] Fix multi-stage unwrapping of behaviors.

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• [Property behaviors] Parse a postfix-expr-suffix after a suppress-unwrap.

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• [Property behaviors] Diagnose extraneous unwrap suppression operators.

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Commits on Mar 15, 2019

• [Property behaviors] Detect and diagnose cyclic property behaviors.

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