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Add #warning and #error description to Changelog #15110

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Mar 9, 2018
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Add #warning and #error description to Changelog #15110

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13 changes: 13 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -23,6 +23,19 @@ CHANGELOG
Swift 4.2
---------

* [SE-0196][]

Custom compile-time warnings or error messages can be emitted using the
`#warning(_:)` and `#error(_:)` directives.

```swift
#warning("this is incomplete")

#if MY_BUILD_CONFIG && MY_OTHER_BUILD_CONFIG
#error("MY_BUILD_CONFIG and MY_OTHER_BUILD_CONFIG cannot both be set")
#endif
```

* Public classes may now have internal `required` initializers. The rule for
`required` initializers is that they must be available everywhere the class
can be subclassed, but previously we said that `required` initializers on
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