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[scopecontrol.js](https://gist.github.com/xnuk/69050c1368cd355b7bea) epic answers
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| console.log((function(){ | |
| var r=Math.random(); | |
| (function(){ | |
| var r=Math.random(); | |
| (function(){ | |
| /* A */ | |
| console.log(-1); | |
| console.log=function(){}; | |
| })() | |
| })() | |
| return r | |
| })()) |
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| var func=((function(){ | |
| var r=Math.random(); | |
| (function(){ | |
| var r=Math.random(); | |
| (function(){ | |
| /* A */ | |
| window.setTimeout(function(){ | |
| func=-1 | |
| },0) | |
| })() | |
| })() | |
| return r | |
| })()) |
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| var func=((function(){ | |
| var r=Math.random(); | |
| (function(){ | |
| var r=Math.random(); | |
| (function(){ | |
| /* A */ | |
| Function.prototype.call=function(){ | |
| return -1 | |
| } | |
| })() | |
| })() | |
| return r | |
| })()) |
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