ufuzz failure

[alexlamsl]

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

var b = NaN >>>= (c = c + 1) + (b >>>= a), NaN = (c = c + 1) + (typeof f0 == "function" && --_calls_ >= 0 && f0());

b && b[a++ + (NaN && NaN.a)];

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

// uglified code
// (beautified)
var n = 2 + ("function" == typeof f0 && f0());

console.log(null, 101, 0, 2, Infinity, n, void 0);

original result:
null 100 0 2 Infinity 2 undefined

uglified result:
null 101 0 2 Infinity 2 undefined

// reduced test case (output will differ)

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

var b = NaN >>>= b >>>= a, NaN = "function";

b && b[a++];

console.log(a, NaN);
// output: 0 'function'
// 
// minify: 1 'function'
// 
// options: {
//   "compress": {
//     "hoist_vars": true,
//     "keep_infinity": true,
//     "passes": 1000000,
//     "unsafe": true
//   },
//   "keep_fnames": true,
//   "toplevel": true,
//   "mangle": {
//     "v8": true
//   },
//   "output": {
//     "v8": true
//   },
//   "validate": true
// }

minify(options):
{
  "compress": {
    "hoist_vars": true,
    "keep_infinity": true,
    "passes": 1000000,
    "unsafe": true
  },
  "keep_fnames": true,
  "toplevel": true,
  "mangle": {
    "v8": true
  },
  "output": {
    "v8": true
  }
}

Suspicious compress options:
  dead_code
  evaluate
  hoist_vars
  passes
  pure_getters
  reduce_vars
  sequences
  side_effects
  unused

Suspicious options:
  toplevel