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[Changelog] Add SE-0268 to the changelog #30903

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Apr 10, 2020
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[Changelog] Add SE-0268 to the changelog #30903

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[Changelog] Add SE-0268 to the changelog, under Swift 5.3
theblixguy Apr 9, 2020
eb702ef
Merge branch 'master' into chore/add-se-0268-to-changelog
theblixguy Apr 9, 2020
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20 changes: 20 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -27,6 +27,25 @@ CHANGELOG
Swift 5.3
----------

* [SE-0268][]:

A `didSet` observer which does not refer to the `oldValue` in its body or does not explicitly request it by placing it in the parameter list (i.e. `didSet(oldValue)`) will no longer trigger a call to the property getter to fetch the `oldValue`.

```swift
class C {
var value: Int = 0 {
didSet { print("didSet called!") }
}
}

let c = C()
// This does not trigger a call to the getter for 'value'
// because the 'didSet' observer on 'value' does not
// refer to the 'oldValue' in its body, which means
// the 'oldValue' does not need to be fetched.
c.value = 1
```

* [SE-0276][]:

Catch clauses in a `do`-`catch` statement can now include multiple patterns in a comma-separated list. The body of a `catch` clause will be executed if a thrown error matches any of its patterns.
Expand Down Expand Up @@ -7982,6 +8001,7 @@ Swift 1.0
[SE-0254]: <https://github.com/apple/swift-evolution/blob/master/proposals/0254-static-subscripts.md>
[SE-0266]: <https://github.com/apple/swift-evolution/blob/master/proposals/0266-synthesized-comparable-for-enumerations.md>
[SE-0267]: <https://github.com/apple/swift-evolution/blob/master/proposals/0267-where-on-contextually-generic.md>
[SE-0268]: <https://github.com/apple/swift-evolution/blob/master/proposals/0268-didset-semantics.md>
[SE-0269]: <https://github.com/apple/swift-evolution/blob/master/proposals/0269-implicit-self-explicit-capture.md>
[SE-0276]: <https://github.com/apple/swift-evolution/blob/master/proposals/0276-multi-pattern-catch-clauses.md>
[SE-0280]: <https://github.com/apple/swift-evolution/blob/master/proposals/0280-enum-cases-as-protocol-witnesses.md>
Expand Down