Ability to inherit multiple classes

[sandeshworld]

I think being able to extend multiple classes would improve usability quite a bit!

The following is currently possible:

class Parrot extends Pigeon {   
  name = "Parrot"               
  diet = "Berries"              
  extinct = false               

  function say() = "Pkl is great!"   
}

It would be useful to also be able to do something like:

class Parrot extends Pigeon, Pet {   
  name = "Parrot"               
  diet = "Berries"              
  extinct = false               

  function say() = "Pkl is great!"   
}

[holzensp]

This would need signficantly more detail (motivation, how to resolve the diamond problem, etc, etc). This is generally a problem in (nominative) hierarchical type systems, so without further restrictions/requirements, this ask can't be satisfied.