ufuzz failure

[alexlamsl]

// original code
// (beautified)
var _calls_ = 10, a = 100, b = 10, c = 0;

if (0 === 1 ? a : b) {
    var expr2 = a++ + [ (c = c + 1) + +function() {
        for (var brake3 = 5; a++ + a++ && brake3 > 0; --brake3) {}
    }(), typeof f1 == "function" && --_calls_ >= 0 && f1((a++ + (("" ^ "c") + (c = c + 1, 
    "c"), 25 - this < ("b" && 24..toString())) || a || 3).toString()), ((yield, foo_2, ...a_2) => {
        {
            var brake5 = 5;
            L11622: while ((c = c + 1) + (typeof f1 == "function" && --_calls_ >= 0 && f1(...[ foo_2, , a++ ], --b + 5)) && --brake5 > 0) {
                var Infinity_2 = {
                    ...a_2
                };
            }
        }
    })(a++ + a--), (c = c + 1) + (typeof a == "function" && --_calls_ >= 0 && a(3)), a && typeof a.foo == "function" && --_calls_ >= 0 && a.foo() ];
    L11621: for (var key2 in expr2) {
        c = 1 + c;
        var arguments = expr2[key2];
        L11623: for (var brake7 = 5; key2 && key2.in && brake7 > 0; --brake7) {
            b--;
        }
    }
}

console.log(null, a, b, c, Infinity, NaN, undefined);

// uglified code
// (beautified)
var _calls_ = 10, a = 100, b = 10, c = 0;

if (b) {
    var key2, expr2 = a++ + [ (c += 1) + +function() {
        for (var brake3 = 5; a++ + a++ && 0 < brake3; --brake3) {}
    }(), "function" == typeof f1 && 0 <= --_calls_ && f1((a++ + (c += 1, 25 - this < 24..toString()) || a || 3).toString()), (() => {
        for (var brake5 = 5; (c += 1) + ("function" == typeof f1 && 0 <= --_calls_ && f1(void 0, void 0, a++, 5 + --b)) && 0 < --brake5; ) {
            ({
                ...a_2
            });
        }
    })((a++, a--)), (c += 1) + ("function" == typeof a && 0 <= --_calls_ && a(3)), a && "function" == typeof a.foo && 0 <= --_calls_ && a.foo() ];
    for (key2 in expr2) {
        for (var c = 1 + c, arguments = expr2[key2], brake7 = 5; key2 && key2.in && 0 < brake7; --brake7) {
            b--;
        }
    }
}

console.log(null, a, b, c, 1 / 0, NaN, void 0);

original result:
null 113 10 28 Infinity NaN undefined

uglified result:
evalmachine.<anonymous>:1
var _calls_=10,a=100,b=10,c=0;if(b){var key2,expr2=a+++[(c+=1)+ +function(){for(var brake3=5;a+++a++&&0<brake3;--brake3);}(),"function"==typeof f1&&0<=--_calls_&&f1((a+++(c+=1,25-this<24..toString())||a||3).toString()),(()=>{for(var brake5=5;(c+=1)+("function"==typeof f1&&0<=--_calls_&&f1(void 0,void 0,a++,5+--b))&&0<--brake5;)({...a_2})})((a++,a--)),(c+=1)+("function"==typeof a&&0<=--_calls_&&a(3)),a&&"function"==typeof a.foo&&0<=--_calls_&&a.foo()];for(key2 in expr2)for(var c=1+c,arguments=expr2[key2],brake7=5;key2&&key2.in&&0<brake7;--brake7)b--}console.log(null,a,b,c,1/0,NaN,void 0);
                                                                                                                                                                                                                                                                                                                                         ^

ReferenceError: a_2 is not defined
    at evalmachine.<anonymous>:1:330
    at evalmachine.<anonymous>:1:342
    at Script.runInContext (vm.js:130:18)
    at Object.runInContext (vm.js:293:6)
    at run_code_vm (D:\a\UglifyJS\UglifyJS\test\sandbox.js:263:12)
    at Object.exports.run_code (D:\a\UglifyJS\UglifyJS\test\sandbox.js:36:38)
    at run_code (D:\a\UglifyJS\UglifyJS\test\ufuzz\index.js:2122:20)
    at D:\a\UglifyJS\UglifyJS\test\ufuzz\index.js:2569:29
    at Array.forEach (<anonymous>)
    at Object.<anonymous> (D:\a\UglifyJS\UglifyJS\test\ufuzz\index.js:2556:20)

// reduced test case (output will differ)

// (beautified)
var a;

((...a_2) => {
    var Infinity_2 = {
        ...a_2
    };
})(a);
// output: 
// minify: ReferenceError: a_2 is not defined
// options: {
//   "mangle": false,
//   "output": {
//     "v8": true
//   },
//   "validate": true
// }

minify(options):
{
  "mangle": false,
  "output": {
    "v8": true
  }
}

Suspicious compress options:
  reduce_vars
  rests
  unused