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Dec 20, 2016
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Update changelog.md to mention new assert with message feature #28156

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fd78c75
Update changelog.md to mention new assert with message feature
mit-mit Dec 20, 2016
08806f6
Fix typo per review feedback
mit-mit Dec 20, 2016
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29 changes: 24 additions & 5 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,16 +1,35 @@
## 1.22.0

### Language

* The `assert()` statement has been expanded to support an optional second
`message` argument (SDK issue [27342](https://github.com/dart-lang/sdk/issues/27342)).

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Maybe use #24213 as the issue number.

The message is displayed if the assert fails. It can be any object, and it
is accessible as `AssertionError.message`. It can be used to provide more
user friendly exception outputs. As an example, the following assert:

```
assert(configFile != null, "Tool config missing. Please see https://goo.gl/k8iAi for details.");
```

would produce the following exception output:

```
Unhandled exception:
'file:///Users/mit/tmp/tool/bin/main.dart': Failed assertion: line 9 pos 10:
'configFile != null': Tool config missing. Please see https://goo.gl/k8iAi for details.
#0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:33)
#1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:29)
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We should hide internal methods in the stack trace.

#2 main (file:///Users/mit/tmp/tool/bin/main.dart:9:10)
```

### Tool changes

* Dart2Js

* Remove support for (long-time deprecated) mixin typedefs.

* Dart Dev Compiler

* Support messages in `assert()` statements. (SDK issue
[27342](https://github.com/dart-lang/sdk/issues/27342))

* Pub

* Avoid using a barback asset server for executables unless they actually use
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