Generator issue: exceptions while initializing arguments

[Jason Orendorff]

On Mon, Sep 10, 2012 at 12:50 PM, Kevin Smith <khs4473 at gmail.com> wrote:
>> >     function f(x=EXPR1, y=EXPR2) { BODY }
>> >     ===>
>> >     function f(x, y) {
>> >         if (x === void 0) x = EXPR1;
>> >         if (y === void 0) y = EXPR2;
>> >         BODY
>> >     }
>
> I'm not so sure - the desugaring above would mean that default expressions
> would have visibility across curly-brace boundaries, which I find to be
> quite surprising.

It is surprising.  It could even bite unwary programmers.  But in what
scope do you propose to evaluate default-param expressions?

-j