1 var ITERATOR = require('./_wks')('iterator')
2 , SAFE_CLOSING = false;
5 var riter = [7][ITERATOR]();
6 riter['return'] = function(){ SAFE_CLOSING = true; };
7 Array.from(riter, function(){ throw 2; });
8 } catch(e){ /* empty */ }
10 module.exports = function(exec, skipClosing){
11 if(!skipClosing && !SAFE_CLOSING)return false;
15 , iter = arr[ITERATOR]();
16 iter.next = function(){ return {done: safe = true}; };
17 arr[ITERATOR] = function(){ return iter; };
19 } catch(e){ /* empty */ }