Generator issue: exceptions while initializing arguments

[Brendan Eich]

Brendan Eich wrote:
> Dmitry Soshnikov wrote:
>> var FOO = 42;
>> function bar(x, y = FOO + z) { var z = 10; } // Error .. ?
>
> Translating to JS as it is:
>
>   var FOO = 42;
>   function bar(x, y) {
>     if (y === void 0) y = FOO + z;
>     var z = 10;
>   } 

Another benefit of the simple semantics: existing JITs can optimize 
easily, no new semantics to special-case. This is not a dominant concern 
but it is a selling point from my experience dealing with (and playing 
one on TV ;-)) implementors.

/be