Issue originally made by Kris Zyp (kriszyp)

Bug information

• Babel version: 6.8.0
• Node version: 6.1.0
• npm version: 3.8.9

Options

presets: ['es2015-loose']

Input code

class Foo extends Bar {
    set foo(value) {
      super.foo = value
    }
  }

Description

The setter produces:

Bar.prototype.foo = value

I know that loose mode isn't precisely spec equivalent, but the resulting code never behaves even close to a true super assignment. A super assignment isn't supposed to assign to the proto object, it is supposed to do assignment to this, using a super setter function if available. I would recommend just leaving loose mode super property handling the same as spec mode, and calling getSuperProperty here (and getting rid of getLooseSuperProperty):
https://github.com/babel/babel/blob/master/packages/babel-helper-replace-supers/src/index.js#L189