Update CHANGELOG.md for recent changes, in particular source breaks
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Slava Pestov
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CHANGELOG.md
117
CHANGELOG.md
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@ -23,12 +23,49 @@ CHANGELOG
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Swift 5.0
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---------
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* Swift 3 mode has been removed. Supported values for the `-swift-version`
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flag are `4`, `4.2`, and `5`.
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* [SE-0228][]:
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String interpolation has been overhauled to improve its performance,
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clarity, and efficiency.
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Note that the old `_ExpressibleByStringInterpolation` protocol has been
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removed; any code making use of this protocol will need to be updated
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for the new design. An `#if compiler` block can be used to conditionalize
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code between 4.2 and 5.0, for example:
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```swift
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#if compiler(<5.0)
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extension MyType : _ExpressibleByStringInterpolation { ... }
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#else
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extension MyType : ExpressibleByStringInterpolation { ... }
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#endif
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```
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* [SE-0213][]:
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If `T` conforms to one of the `ExpressibleBy*` protocols and `literal` is a
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literal expression, then `T(literal)` will construct a literal of type `T`
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using the corresponding protocol, rather than calling a constructor member
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of `T` with a value of the protocol's default literal type.
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For example, expressions like `UInt64(0xffff_ffff_ffff_ffff)` are now valid,
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where previously they would overflow the default integer literal type of `Int`.
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* [SE-0230][]:
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In Swift 5 mode, `try?` with an expression of Optional type will flatten the
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resulting Optional, instead of returning an Optional of an Optional.
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* [SR-5719][]:
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Starting from `-swift-version 5`, implicit `@autoclosure` function type
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forwarding has been disabled, and new a diagnostic has been added suggesting
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to add `()` to call the function value in such case. The call itself would be
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wrapped in an implicit closure and passed to the corresponding parameter.
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In Swift 5 mode, `@autoclosure` parameters can no longer be forwarded to
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`@autoclosure` arguments in another function call. Instead, you must explicitly
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call the function value with `()`; the call itself is wrapped inside an
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implicit closure, guaranteeing the same behavior as in Swift 4 mode.
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Example:
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@ -40,6 +77,56 @@ Swift 5.0
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}
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```
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* [SR-8109][]:
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Single-element labeled tuple expressions, for example `(label: 123)`, were
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allowed in some contexts but often resulted in surprising, inconsistent
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behavior that varied across compiler releases. They are now completely
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disallowed.
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Note that single-element labeled _types_, for example `var x: (label: Int)`,
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have already been prohibited since Swift 3.
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* [SR-695][]:
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In Swift 5 mode, a class method returning `Self` can no longer be overridden
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with a method returning a non-final concrete class type. Such code is not
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type safe and will need to be updated.
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For example,
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```swift
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class Base {
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class func factory() -> Self { ... }
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}
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class Derived : Base {
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class override func factory() -> Derived { ... }
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}
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```
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* In Swift 5 mode, the type of `self` in a convenience initializer of a non-final
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class is now the dynamic `Self` type, and not the concrete class type.
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* [SR-5581][]:
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Protocols can now constrain their conforming types to those that subclasses a
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given class. Two equivalent forms are supported:
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```swift
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protocol MyView : UIView { ... }
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protocol MyView where Self : UIView { ... }
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```
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Note that Swift 4.2 accepted the second form, but it was not fully implemented
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and could sometimes crash at compile time or run time.
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* [SR-631][]:
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Extension binding now supports extensions of nested types which themselves are
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defined inside extensions. Previously this could fail with some declaration orders,
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producing spurious "undeclared type" errors.
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* [SR-7139][]:
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Exclusive memory access is now enforced at runtime by default in
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@ -129,7 +216,7 @@ Swift 5.0
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* [SE-0214][]:
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Renamed the `DictionaryLiteral` type to `KeyValuePairs`.
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The `DictionaryLiteral` type has been renamed to `KeyValuePairs`.
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A typealias preserves the old name for compatibility.
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* [SR-2608][]
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@ -137,8 +224,16 @@ Swift 5.0
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Default arguments are now printed in SourceKit-generated interfaces for Swift
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modules, instead of just using a placeholder `default`.
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* Notable bug fix: unowned and unowned(unsafe) variables now support optional
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types.
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* `unowned` and `unowned(unsafe)` variables now support Optional types.
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* Designated initializers with variadic parameters are now correctly inherited
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in subclasses.
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* Extensions of concrete subclasses of generic classes can now contain
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`@objc` members.
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* Complex recursive type definitions involving classes and generics that would
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previously cause deadlocks at run time are now fully supported.
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* [SR-419][]
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@ -7309,9 +7404,13 @@ Swift 1.0
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[SE-0225]: <https://github.com/apple/swift-evolution/blob/master/proposals/0225-binaryinteger-iseven-isodd-ismultiple.md>
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[SE-0226]: <https://github.com/apple/swift-evolution/blob/master/proposals/0226-package-manager-target-based-dep-resolution.md>
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[SE-0227]: <https://github.com/apple/swift-evolution/blob/master/proposals/0227-identity-keypath.md>
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[SE-0228]: <https://github.com/apple/swift-evolution/blob/master/proposals/0228-fix-expressiblebystringinterpolation.md>
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[SE-0230]: <https://github.com/apple/swift-evolution/blob/master/proposals/0230-flatten-optional-try.md>
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[SR-106]: <https://bugs.swift.org/browse/SR-106>
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[SR-419]: <https://bugs.swift.org/browse/SR-419>
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[SR-631]: <https://bugs.swift.org/browse/SR-631>
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[SR-695]: <https://bugs.swift.org/browse/SR-695>
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[SR-1009]: <https://bugs.swift.org/browse/SR-1009>
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[SR-1446]: <https://bugs.swift.org/browse/SR-1446>
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[SR-1529]: <https://bugs.swift.org/browse/SR-1529>
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@ -7320,6 +7419,8 @@ Swift 1.0
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[SR-2394]: <https://bugs.swift.org/browse/SR-2394>
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[SR-2608]: <https://bugs.swift.org/browse/SR-2608>
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[SR-4248]: <https://bugs.swift.org/browse/SR-4248>
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[SR-5581]: <https://bugs.swift.org/browse/SR-5581>
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[SR-5719]: <https://bugs.swift.org/browse/SR-5719>
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[SR-7139]: <https://bugs.swift.org/browse/SR-7139>
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[SR-7251]: <https://bugs.swift.org/browse/SR-7251>
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[SR-5719]: <https://bugs.swift.org/browse/SR-5719>
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[SR-8109]: <https://bugs.swift.org/browse/SR-8109>
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