ufuzz failure

[alexlamsl]

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

(c = c + 1) + (typeof a == "function" && --_calls_ >= 0 && a(--b + ((-4 >>> NaN) / (null !== 0) | (-2 === -4) > (0 ^ 4)), (c = c + 1) + (a && a[-((-3 + -0 > "b" >>> -1) % ((-4 < null) >> ("object" >= 25)))]) ? (c = c + 1) + true : {
    foo: (c = c + 1) + a,
    "": (c = c + 1) + void function() {
        c = c + 1;
    }(),
    1.5: a++ + void b,
    set null(a_2) {
        try {
            if (--b + (a_2 |= (c = 1 + c, (a_2 >>>= "object" - NaN) <= ("b" ^ -0) | (/[a2][^e]+$/ | [ , 0 ].length === 2) != false + {}))) {
                var expr5 = (c = 1 + c, (0 !== 24..toString()) >> (22 | "number") <= (a_2 && (a_2[b = a] /= 2 >>> true ^ -2 >> -3)));
                L20933: for (var key5 in expr5) {
                    c = 1 + c;
                    var arguments = expr5[key5];
                    c = 1 + c, ((23..toString() == 22) >= (38..toString() < NaN)) >>> (c = c + 1, Infinity || -5);
                }
            } else {
                var brake7 = 5;
                L20934: while ((c = 1 + c, (a_2 &= -5 >>> "number" & (23..toString() || 4)) === (23..toString() > 4) >> ("function" != -4)) && --brake7 > 0) {
                    c = 1 + c, ((2 | 24..toString()) + (-4 === 2)) * (4 < false | 3 == 3);
                }
            }
        } catch (foo_1) {
            try {
                c = 1 + c, ([], [ , 0 ][1]) / !38..toString() <= ({} - [ , 0 ][1] !== (true, -3));
            } catch (Math_1) {
            } finally {
            }
            c = c + 1;
        }
        this.Infinity += (a_2 && (a_2[a++ + [][b = a]] = ((22 | 1) + (NaN < true) ^ ~(Infinity * "a")) & (a_2 = "foo" && "foo") << (-1 | "") << ("object" * "function" || 2 & "undefined"))) < ((-2 != "" && {} >> 3) | (a_2 && (a_2[typeof f1 == "function" && --_calls_ >= 0 && f1(3, -4)] = null - "b" >>> (a_2 += "" >> 3)))) >> ((a_2 = ("foo" !== 2) / (NaN !== -4)) && (c = c + 1, 
        a_2 && (a_2[c = 1 + c, (/[a2][^e]+$/ <= 23..toString() >= void 22) / ((a_2 && (a_2.a /= 5 < [ , 0 ][1])) >= (24..toString(), 
        ""))] = "c" * 2)));
    },
    3: --b + ((c = c + 1) + [ --b + (typeof f0 == "function" && --_calls_ >= 0 && f0(true, 22, 3)), b += a ].null ? typeof a == "function" && --_calls_ >= 0 && a() : (a++ + (a = (c = c + 1) + ((c = 1 + c, 
    (a && (a.null += (c = c + 1, undefined) * ("b" >> 24..toString()))) | ([ , 0 ].length === 2 | NaN) !== ([ , 0 ][1] ^ 25)) ? (c = 1 + c, 
    (c = c + 1, 22 && "undefined") < (23..toString() - 1 && 22 * 23..toString())) : (c = 1 + c, 
    ("" & null) >>> (2 >= 0) !== -5 % 1 >> (a && (a.null = 3 / [ , 0 ][1]))))) || 1).toString()[--b + (typeof a == "function" && --_calls_ >= 0 && a(/[a2][^e]+$/, (c = 1 + c, 
    (("foo" && "c") !== (-0 & this)) * (([] !== 5) >= (-0 || 24..toString()))), (c = 1 + c, 
    {} === "function" !== ([ , 0 ].length === 2 || "function") | "foo" * false != (5 === undefined))))])
}, -3));

L20935: {
    {
        var brake15 = 5;
        L20936: do {
            L20937: {
                {
                    var brake17 = 5;
                    do {
                        {
                            continue L20936;
                            {
                                var expr20 = a++ + (b + 1 - .1 - .1 - .1);
                                for (var key20 in expr20) {
                                    {
                                        var expr21 = a;
                                        for (var key21 in expr21) {
                                            {
                                                var brake22 = 5;
                                                do {
                                                    c = 1 + c, ("object" !== this) <= this % this && ([] > "number") - ({} + -1);
                                                } while ((c = 1 + c, a && (a[a++ + void ((null >> "bar") / (1 || "undefined") < (24..toString() || -3, 
                                                undefined > undefined))] = 1 / -4 >= ("function" || [ , 0 ].length === 2) === (c = c + 1, 
                                                23..toString()) <= (-3 != "a"))) && --brake22 > 0);
                                            }
                                        }
                                    }
                                }
                            }
                            a;
                            var b_2 = (c = c + 1) + typeof (a++ + /[abc4]/.test(((c = 1 + c, ((b_2 && (b_2[c = 1 + c, 
                            (undefined % ([ , 0 ].length === 2) != ("function" == 2)) % (("bar" || -1) < ([ , 0 ][1] ^ false))] = "undefined" ^ undefined)) ^ (b_2 /= "bar" >>> "b")) >>> ((Infinity, 
                            []) < (3 ^ this))) || b || 5).toString()));
                        }
                    } while (a++ && --brake17 > 0);
                }
                {
                    {
                        var expr27 = ++a;
                        for (var key27 in expr27) {
                            c = 1 + c;
                            var b_2_2 = expr27[key27];
                            var NaN;
                        }
                    }
                    b_2 = -5 % 38..toString() || [ , 0 ][1] === "object" || ("c" || 5) === NaN >= "c";
                }
                var undefined = --b + (b_2_2 && b_2_2.null);
                for (var brake31 = 5; b++ && brake31 > 0; --brake31) {
                    (c = c + 1) + [ , typeof b_2_2 == "function" && --_calls_ >= 0 && b_2_2(-1), a++ + --b, a++ + /[abc4]/.test((/[abc4]/.test(((c = 1 + c, 
                    "bar" % 2 % (0 + -4) && ([ , 0 ][1] != "a") << true - undefined) || b || 5).toString()) || b || 5).toString()) ].a;
                }
            }
        } while (("b" + "undefined" ^ (b_2 && (b_2[c = 1 + c, (Infinity | "c") - (Infinity + -4) > ((b_2_2 += -2 && "number") ^ null < "")] = ([ , 0 ].length === 2) >= 0)) || ((b_2_2 -= "number" === -1) || "b" >= "object")) && --brake15 > 0);
    }
    {
        var expr33 = --b + {
            3: "undefined",
            1.5: a++ + delete ((0 <= 25) / (-3 === 2) + (b_1 += (NaN <= "foo") + (-2 == "object")))
        };
        L20938: for (var key33 in expr33) {
            c = 1 + c;
            var b_1 = expr33[key33];
            (c = c + 1) + (typeof b_1 == "function" && --_calls_ >= 0 && b_1());
        }
    }
}

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

// uglified code
// (beautified)
var t = 10, a = 100, r = 10, e = 0;

e += 1, "function" == typeof a && 0 <= --t && a(--r - 4, (e += 1) + (a && a[-0]) ? (e += 1) + !0 : {
    foo: (e += 1) + a,
    "": (e += 1) + void (e += 1),
    1.5: a++ + void 0,
    set null(n) {
        try {
            if (--r + (n |= (e = 1 + e, (n >>>= NaN) <= 0 | !0))) {
                var o = (e = 1 + e, 0 <= (n && (n[r = a] /= -2)));
                for (var f in o) {
                    e = 1 + (1 + e), e += 1;
                }
            } else {
                for (var i = 5; e = 1 + e, 0 == (n &= 19) && 0 < --i; ) {
                    e = 1 + e;
                }
            }
        } catch (n) {
            try {
                e = 1 + e;
            } catch (n) {}
            e += 1;
        }
        this.Infinity += (n && (n[a++ + [][r = a]] = -24 & (n = "foo") << -1 << 0)) < (0 | (n && (n["function" == typeof f1 && 0 <= --t && f1(3, -4)] = NaN >>> (n += 0)))) >> ((n = 1) && (e += 1, 
        n && (n[e = 1 + e, !1 / ("" <= (n && (n.a /= !1)))] = NaN)));
    },
    3: --r + ((e += 1) + [ --r + ("function" == typeof f0 && 0 <= --t && f0(!0, 22, 3)), r += a ].null ? "function" == typeof a && 0 <= --t && a() : ("" + (a++ + (a = (e += 1) + (e = 1 + e, 
    !0 | (a && (a.null += 0 * (e += 1, u))) ? (e = 1 + e, e += 1, !1) : (e = 1 + e, 
    0 != -0 >> (a && (a.null = 1 / 0))))) || 1))[--r + ("function" == typeof a && 0 <= --t && a(/[a2][^e]+$/, !1 * ("c" !== (-0 & this)), (e = 1 + (1 + e), 
    !0 | NaN != (5 === u))))])
}, -3);

var n = 5;

n: do {
    var o = 5;
    do {
        continue n;
    } while (a++ && 0 < --o);
    var f = ++a;
    for (var i in f) {
        e = 1 + e;
        var l = f[i];
    }
    for (var u = --r + (l && l.null), v = 5; r++ && 0 < v; --v) {
        e += 1, "function" == typeof l && 0 <= --t && l(-1), a++, --r, a++, e = 1 + e;
    }
} while (("bundefined" ^ ((-5)[e = 1 + e, -1 / 0 > (!1 ^ (l += "number"))] = !0) || (l -= !1)) && 0 < --n);

var c = --r + {
    3: "undefined",
    1.5: a++ + (d += 0, !0)
};

for (var y in c) {
    e = 1 + e;
    var d = c[y];
    e += 1, "function" == typeof d && 0 <= --t && d();
}

console.log(null, a, r, e, 1 / 0, void 0, u);

original result:
null 101 9 33 Infinity undefined undefined

uglified result:
null 101 9 38 Infinity undefined undefined

minify(options):
{
  "compress": {
    "passes": 1000000,
    "unsafe": true
  },
  "toplevel": true
}