Simon Lydell 6d9553a016 Implement ES2015-like destructuring defaults ...

This let's you do things like:

    fullName = ({first = 'John', last = 'Doe'}) -> "#{first} #{last}"

Note: CoffeeScrits treats `undefined` and `null` the same, and that's true in
the case of destructuring defaults as well, as opposed to ES2015 which only uses
the default value if the target is `undefined`. A similar ES2015 difference
already exists for function parameter defaults. It is important for CoffeeScript
to be consistent with itself.

    fullName2 = (first = 'John', last = 'Doe') -> "#{first} #{last}"
    assert fullName('Bob', null) is fullName2(first: 'Bob', last: null)

Fixes #1558, #3288 and #4005.

2015-08-27 22:16:13 +02:00

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