ufuzz failure

[alexlamsl]

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

{
    var brake1 = 5;
    do {
        break;
    } while (typeof f1 == "function" && --_calls_ >= 0 && f1(a++ + (typeof f0 == "function" && --_calls_ >= 0 && f0())) && --brake1 > 0);
}

var b_2 = b = a, b = [ b_2 && typeof b_2.a == "function" && --_calls_ >= 0 && b_2.a(), , (c = c + 1) + ((c = c + 1) + (b >>>= a)) ];

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

// uglified code
// (beautified)
var f = 10, n = 100, o = 10, e = 5;

do {
    break;
} while ("function" == typeof f1 && 0 <= --f && f1(n++ + ("function" == typeof f0 && 0 <= --f && f0())) && 0 < --e);

o = [ n && "function" == typeof n.a && 0 <= --f && (o = n).a(), , 1 + (2 + (o >>>= n)) ];

console.log(null, n, o, 2, Infinity, NaN, undefined);

original result:
null 100 { '0': false, '2': 9 } 2 Infinity NaN undefined

uglified result:
null 100 { '0': false, '2': 3 } 2 Infinity NaN undefined

// reduced test case (output will differ)

// (beautified)
var a = 0, b = 1;

var brake1 = 0;

0 && a++;

var b_2 = b = a, b = [ b_2 && b_2, b >>>= 0 ];

console.log(b);
// output: { '0': 0, '1': 0 }
// 
// minify: { '0': 0, '1': 1 }
// 
// options: {
//   "ie8": true,
//   "toplevel": true,
//   "mangle": {
//     "v8": true
//   },
//   "output": {
//     "v8": true
//   },
//   "validate": true
// }

minify(options):
{
  "ie8": true,
  "toplevel": true,
  "mangle": {
    "v8": true
  },
  "output": {
    "v8": true
  }
}

Suspicious compress options:
  collapse_vars
  join_vars
  reduce_vars

Suspicious options:
  toplevel