Allen Wirfs-Brock wrote:
So, it seems that nested function declarations must be instantiated and bound before parameter instantiation/default value initialization and that parameters that share a name with a such function declaration do not get reinitialized (with either an argument or default value) during parameter instantiation.
Yes, this was what I remember us agreeing to the other week (was it last week? A blur...).
It's the "simpler desugaring wins" case. Parameters are var-like and defaulting happens in the body.
Separately, I agree with David, Oliver, Jason, Mark and probably everyone that new syntax can mean new checks pulled in from strict mode. Duplicate formal parameters with defaulting? Error!
We did this in SpiderMonkey for duplicate formals + destructuring, and the same argument applies there. I don't remember what our default parameter impl does with dups, though.
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