Self reference within destructuring

[thysultan]

The syntax makes it look like the binding would not be available inside the destructuring context.

For example consider the following:

function fn (arg pick {a, b = arg.b = 'value'}) {}

This visually queues that you can reference arg within the de-structure to archive the above. However with the current grammer:

function fn ({a, b = arg.b = 'value'} as arg) {}

Unless i'm mistaken and the two are indeed equivalent as far as being able to self reference the argument within the destructuring context.