he/him 
turns out you can init a variable in a for in loop: `for (var x = a in b) console.log(x)`. Looks weird. Useless?
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@sebmck I found this from an error from generated code from Babel with an 'in' operator in the for-loop. Big report comingThanks. Twitter will use this to make your timeline better. UndoUndo
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