Breaking Changes Super This

super and this

In the constructor of a derived class (a class that extends another class), this cannot be used before calling super:

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:

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')