Inheritance Model

• abstract functions may have body (like C++)

• functions overriding a function should have the "override" attribute set

• abstract variables can be defined

  • requires the child classes or implementing classes to implement the member

  • non-abstrcat variable definitions should not have the "override" attribute set

• classes can have abstract or concrete functions / variables

• interfaces may have abstract functions (without body) or abstract variables

• mixins can have anything that a class may have

• "class E extends A implements C, D" means:

  • C can override members of A (*1)

  • D can override members of the production of *1 (*2)

  • E can override members of the production of *2

as an example, see t/run/048.interface-with-abstract-var.jsx