'var' legal in for..in?

[Mark Ethan Trostler]

> Howdy,
>  Is this legal ES6 syntax:
> 
> for (var x in [ 1,2,3 ] ) { ... }  //?
> 
> Can the 'var' be in there?  There was alleged talk at some point about making 
> that illegal? Hard to tell from looking at the spec thanks!! 
>   Mark
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