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### `super` and `this`
In the constructor of a derived class (a class that `extends` another class), `this` cannot be used before calling `super`:
```coffee
class B extends A
constructor: -> this # Throws a compiler error
```
This also means you cannot pass a reference to `this` as an argument to `super` in the constructor of a derived class:
```coffee
class B extends A
constructor: (@arg) ->
super @arg # Throws a compiler error
```
This is a limitation of ES2015 classes. As a workaround, assign to `this` after the `super` call:
```
codeFor('breaking_change_super_this')
```
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