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[5.9] [Changelog] Add changelog entry for SE-0380 #65888

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May 13, 2023
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[5.9] [Changelog] Add changelog entry for SE-0380 #65888

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34 changes: 34 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -4,6 +4,39 @@ _**Note:** This is in reverse chronological order, so newer entries are added to

## Swift 5.9

* [SE-0380][]:

`if` and `switch` statements may now be used as expressions to:

* Return values from functions, properties, and closures (either with
implicit or explicit `return`)
* Throw errors using `throw`
* Assign values to variables
* Declare variables

Each branch of the `if` or `switch` must be a single expression, the value
of which becomes the value of the overall expression when that branch is
chosen.

```swift
let bullet =
if isRoot && (count == 0 || !willExpand) { "" }
else if count == 0 { "- " }
else if maxDepth <= 0 { "▹ " }
else { "▿ " }
```

```swift
public static func width(_ x: Unicode.Scalar) -> Int {
switch x.value {
case 0..<0x80: 1
case 0x80..<0x0800: 2
case 0x0800..<0x1_0000: 3
default: 4
}
}
```

* [#64927][]:

Swift 5.9 introduces warnings that catch conversions from an inout
Expand Down Expand Up @@ -9729,6 +9762,7 @@ using the `.dynamicType` member to retrieve the type of an expression should mig
[SE-0370]: <https://github.com/apple/swift-evolution/blob/main/proposals/0370-pointer-family-initialization-improvements.md>
[SE-0376]: <https://github.com/apple/swift-evolution/blob/main/proposals/0376-function-back-deployment.md>
[SE-0377]: <https://github.com/apple/swift-evolution/blob/main/proposals/0377-parameter-ownership-modifiers.md>
[SE-0380]: <https://github.com/apple/swift-evolution/blob/main/proposals/0380-if-switch-expressions.md>

[#64927]: <https://github.com/apple/swift/issues/64927>
[#42697]: <https://github.com/apple/swift/issues/42697>
Expand Down