function foo(x){
return [x + 1, null];
}
var x = 5;
if (x % 2 == 1 ){
var [x,y]=foo(x);
if (y!=null){
console.fatal("Error");
}
console.log(x);
}
console.log(x);
ZnVuY3Rpb24gZm9vKHgpewogICAgcmV0dXJuIFt4ICsgMSwgbnVsbF07Cn0KCnZhciB4ID0gNTsKaWYgKHggJSAyID09IDEgKXsKICAgIHZhciBbeCx5XT1mb28oeCk7CiAgICBpZiAoeSE9bnVsbCl7CiAgICAgICAgY29uc29sZS5mYXRhbCgiRXJyb3IiKTsKICAgIH0KICAgIGNvbnNvbGUubG9nKHgpOwp9CmNvbnNvbGUubG9nKHgpOw==