ufuzz failure

[alexlamsl]

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

function f0() {
    function f1(bar_2) {
        {
            var brake1 = 5;
            do {
                {
                    var brake2 = 5;
                    while (--b && --brake2 > 0) {
                        var expr3 = a++ + ((c = 1 + c, /[a2][^e]+$/ + null - (4 << "") ^ ("" != this) >= (false | true)) || a || 3).toString();
                        for (var key3 in expr3) {
                            c = c + 1;
                        }
                    }
                }
            } while (--b + void b && --brake1 > 0);
        }
        try {
            try {
                {
                    var c_2 = function f2(NaN, bar_2_2) {
                    }((c = 1 + c, 23..toString() % [] >= 3 << ([ , 0 ].length === 2) && (5 >> false && "object" ^ NaN)), (c = 1 + c, 
                    ("b" < 1) << (c = c + 1, NaN) >>> ((-3 | -2) === -1 < "function")), false);
                }
            } finally {
                {
                    var brake8 = 5;
                    do {
                        c = 1 + c, delete (bar_2 && (bar_2[(c = 1 + c, (3 / "", "" === 4) & [] + undefined == [] < -5)] = {} >= "foo")) <= ("" == undefined) << (-3 >> undefined);
                    } while ((c = 1 + c, (bar_2 && (bar_2[(c = 1 + c, (2 == "") <= ([] == 38..toString()) ^ (c_2 && (c_2.c = "a" & Infinity)) / (-2 || -2))] = this * 5)) > (4 & undefined) !== (-1 % 0 | (0 | Infinity))) && --brake8 > 0);
                }
                {
                    var brake10 = 5;
                    do {
                        c = 1 + c, bar_2 && (bar_2[void function a_2() {
                        }()] += 2 - 24..toString() | NaN <= this), c_2.NaN <<= "undefined" <= -5 != 23..toString() >= 2;
                    } while ((c = 1 + c, -3 >> "undefined" <= void -5 || 5 + 22 - (22 === 22)) && --brake10 > 0);
                }
            }
        } catch (a_2) {
            {
                var brake12 = 5;
                while (+ -3 - (4 === 38..toString()) < (-5 >> -5 !== (23..toString() & -5)) && --brake12 > 0) {
                    var a_1;
                }
            }
            for (var brake14 = 5; ((c = 1 + c, c = c + 1, 25 <= 2 !== (/[a2][^e]+$/ || false)) || 1).toString()[(c = 1 + c, 
            (!-4 && this ^ -0) ^ "bar" <= 3 < (false == "c"))] && brake14 > 0; --brake14) {
                var brake15 = 5;
                do {
                    c = 1 + c, ((a_2 >>= false >> true) <= (undefined ^ 0)) >>> ((a_2 && (a_2[(c = 1 + c, 
                    (38..toString() ^ -0) - ([] == 5), (c = c + 1, "c") >= ([ , 0 ][1] === "c"))] += (0, 
                    25))) <= (bar_2 && (bar_2.null = [] < -1)));
                } while ((c = 1 + c, (bar_2 && (bar_2.b >>= ([ , 0 ][1], "undefined") != ("function" ^ 1))) >>> (a_1 && (a_1[(c = c + 1) + -((23..toString() >>> true & 25 / "foo") != (22 && undefined) * ("undefined" > 5))] = 23..toString() & NaN & 22 <= this))) && --brake15 > 0);
            }
        }
    }
    var bar_2 = f1(1 === 1 ? a : b, void ("object" - -4) === false / "object" * (38..toString() <= "object"), true);
    function f3(bar_2, a_2, b_2) {
        if (-b) {
            var foo_2 = function f4(a_1, a_2, a) {
                c = 1 + c, ({} <= "foo" === (undefined | "object")) * ~(bar_2 && (bar_2.in /= [ , 0 ][1] != this));
                c = 1 + c, -2 << -3 ^ [ , 0 ][1] >> 4 && ([ , 0 ].length === 2 == 22) > "" >>> "";
            }(/[a2][^e]+$/, 25, (c = 1 + c, (38..toString() * "a" - ("" <= this)) / (4 + 4 | (c = c + 1, 
            3))));
        }
    }
    var NaN_1 = f3(a++ + (typeof f4 == "function" && --_calls_ >= 0 && f4()), "");
    function f5() {
        if (0 === 1 ? a : b) {
            return;
            --b;
        }
    }
    var b_1 = f5(a++ + (bar_2 && bar_2[a++ + ((4 | 0) >> (/[a2][^e]+$/ != 0) >> (this + 4 << ("bar" === true)))]), --b + {
        a: (a++ + delete a || a || 3).toString(),
        in: a++,
        a: [ (c = 1 + c, (true ^ 1 ^ this !== "function") & (4 ^ NaN ^ 22 & 2)), (c = 1 + c, 
        NaN_1 && (NaN_1.Infinity += (-3 < "b" ^ -4 === "c") >> ("b" < [] & (true & this)))), (c = 1 + c, 
        (23..toString() || -3) << (5 >> "c") << ((undefined && "a") >>> (c = c + 1, 25))), (c = 1 + c, 
        (/[a2][^e]+$/ + {} !== ("b" || 38..toString())) >>> (null < false) * (NaN || "object")) ],
        foo: (c = c + 1) + (NaN_1 >>>= --b + ((c = 1 + c, ([] === 1 != ([] === "foo")) >= (38..toString() << "b", 
        NaN_1 && (NaN_1[(c = 1 + c, ((bar_2 && (bar_2.b >>>= [ , 0 ][1] | [ , 0 ].length === 2)) != Infinity >>> "b") % delete !5)] += ([ , 0 ][1], 
        "a")))) || a || 3).toString()),
        c: a++ + function() {
            c = 1 + c, NaN_1 && (NaN_1.a = (0 && "bar", "number" > -4)), {} >= "function" & (1 || "a");
            c = 1 + c, (bar_2 && (bar_2.c += delete 0 / (-1 && -1))) % ((-2 ^ undefined) >> (23..toString() >>> 0));
        }
    }, "object");
    function f6(NaN_1) {
        if ([ 0 === 1 ? a : b, --b + !((NaN || 38..toString(), "number" - "b") & (4 ^ -1 | -1 & 5)), ,  ][--b + void (("bar" === -2) > (undefined & /[a2][^e]+$/) !== (NaN_1 && (NaN_1[--b + (bar_2 && bar_2[(c = 1 + c, 
        void null >> (38..toString() >> "b") === ("b" * true | (bar_2 && (bar_2[(c = 1 + c, 
        ((/[a2][^e]+$/, true) == (bar_2 && (bar_2.undefined += [ , 0 ][1] <= "object"))) - (("foo" ^ "foo") >= (5, 
        "foo")))] = {} - "object"))))])] = -2 - true | -2 != "a"))) ? a++ + (typeof NaN_1 == "function" && --_calls_ >= 0 && NaN_1((c = 1 + c, 
        (c = c + 1, "c") < (4 ^ 1) & (null || -0) !== "b" >> ([ , 0 ].length === 2)), "foo")) : !function() {
        }()]) {
            if ((c = c + 1) + bar_2) {
                for (var brake30 = 5; (c = c + 1) + a++ && brake30 > 0; --brake30) {
                    var expr31 = (c = 1 + c, (-3 ^ [ , 0 ].length === 2, "c" % "b") & (23..toString() >= false) + 25 / -5);
                    for (var key31 in expr31) {
                        c = 1 + c;
                        var foo_2 = expr31[key31];
                        c = 1 + c, ((-2 | 24..toString()) ^ ([], "object")) & ({} || "bar") >>> 2 / "";
                    }
                }
            } else {
                for (var brake33 = 5; -(24..toString() <= -2 == "" << 23..toString() ^ false % "c" >> (38..toString() || 1)) && brake33 > 0; --brake33) {
                    var brake34 = 5;
                    while ((c = 1 + c, (22 == undefined ^ (bar_2 && (bar_2[(c = 1 + c, ("undefined" !== 22) - (0 ^ 5) != ("foo" / [] && 22 + {}))] |= NaN > false))) << (NaN_1 && (NaN_1[void function() {
                    }()] = "bar" >>> -0 != (3 == [ , 0 ][1])))) && --brake34 > 0) {
                        c = 1 + c, ("foo" > 23..toString()) * (1 + 1) >= -2 >> [ , 0 ][1] << ("function" && -0);
                    }
                }
            }
        }
    }
    var foo_1 = f6((this ^ [ , 0 ][1]) >= ("a" !== "foo") || (null != "a", 22 || 38..toString()), (c = c + 1) + void ("undefined" & undefined ^ (c = c + 1, 
    /[a2][^e]+$/), NaN == 2, ([ , 0 ].length === 2) <= "a"));
}

var arguments_1 = f0(--b + b++, 24..toString(), this);

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

// uglified code
// (beautified)
var d = 10, c = 100, l = 10, h = 0;

(function o() {
    var a = function u(n) {
        var t = 5;
        do {
            for (var i = 5; --l && 0 < --i; ) {
                var o = c++ + (h = 1 + h, NaN ^ 1 <= ("" != this) || c || 3).toString();
                for (var r in o) {
                    h += 1;
                }
            }
        } while (--l + void 0 && 0 < --t);
        try {
            try {
                var f = (h = 1 + h, 23..toString() % [] >= 3 << (2 === [ , 0 ].length) && NaN, h = 1 + h, 
                h += 1, void NaN);
            } finally {
                for (var a = 5; h = 1 + h, n && (n[(h = 1 + h, !1 & [] + undefined == [] < -5)] = "foo" <= {}), 
                undefined, undefined, h = 1 + h, (n && (n[(h = 1 + h, !1 <= ([] == 38..toString()) ^ (f && (f.c = "a" & Infinity)) / -2)] = 5 * this)) > (4 & undefined) !== (0 | Infinity) && 0 < --a; ) {}
                for (var e = 5; h = 1 + h, n && (n[void function S() {}()] += 2 - 24..toString() | NaN <= this), 
                f.NaN <<= 0 != 2 <= 23..toString(), h = 1 + h, 0 < --e; ) {}
            }
        } catch (S) {
            for (var d = 5; -3 - (4 === 38..toString()) < (-1 != (-5 & 23..toString())) && 0 < --d; ) {
                var N;
            }
            for (var g = 5; (h = 1 + h, h += 1, !0).toString()[(h = 1 + h, 0)] && 0 < g; --g) {
                for (var v = 5; h = 1 + h, undefined, S && (S[(h = 1 + h, 38..toString(), h += 1, 
                !1)] += 25), n && (n["null"] = [] < -1), h = 1 + h, (n && (n.b >>= !0)) >>> N && 0 < --v; ) {}
            }
        }
    }(c, 38..toString()), n = function t(n) {
        if (-l) {
            (function() {
                h = 1 + h, undefined, n && (n["in"] /= 0 != this), h = 1 + h;
            })((h = 1 + h, 38..toString(), h += 1));
        }
    }(c++ + ("function" == typeof f4 && 0 <= --d && f4()));
    (function i() {})((c++, a && a[c++ + (2 >> (this + 4 << !1))]), (--l, (c++ + delete c || c || 3).toString(), 
    c++, h = 1 + h, NaN, h = 1 + h, n && (n.Infinity += 0 >> ("b" < [] & !0 & this)), 
    h = 1 + h, 23..toString(), undefined, h = 1 + (h += 1), NaN, n >>>= --l + (h = 1 + (h += 1), 
    (1 === [] != ("foo" === [])) >= (38..toString(), n && (n[(h = 1 + h, ((a && (a.b >>>= 0 | 2 === [ , 0 ].length)) != Infinity >>> "b") % !0)] += "a")) || c || 3).toString(), 
    c++)), function e(n) {
        if ([ l, --l + !(-1 & (NaN || 38..toString(), NaN)), ,  ][!(--l + void (undefined, 
        n && (n[--l + (a && a[(h = 1 + h, void 0 >> (38..toString() >> "b") == (NaN | (a && (a[(h = 1 + h, 
        (!0 == (a && (a.undefined += !1))) - !1)] = {} - "object"))))])] = -3))) || c++ + ("function" == typeof n && 0 <= --d && n((h = 1 + h, 
        h += 1, !1 & -0 != "b" >> (2 === [ , 0 ].length)), "foo"))]) {
            if ((h += 1) + a) {
                for (var t = 5; (h += 1) + c++ && 0 < t; --t) {
                    var i = (h = 1 + h, NaN & (!1 <= 23..toString()) + -5);
                    for (var o in i) {
                        h = 1 + (h = 1 + h), 24..toString();
                    }
                }
            } else {
                for (var r = 5; -(24..toString() <= -2 == "" << 23..toString() ^ NaN >> (38..toString() || 1)) && 0 < r; --r) {
                    for (var f = 5; h = 1 + h, (22 == undefined ^ (a && (a[(h = 1 + h, -4 != ("foo" / [] && 22 + {}))] |= !1 < NaN))) << (n && (n[void 0] = !1)) && 0 < --f; ) {
                        h = 1 + h, 23..toString();
                    }
                }
            }
        }
    }(!0 <= (0 ^ this) || 22, (h += 1, undefined, h += 1, NaN));
})((--l, l++), 24..toString());

console.log(null, c, l, h, Infinity, NaN, undefined);

original result:
�[1mnull�[22m �[33m109�[39m �[33m-1�[39m �[33m85�[39m �[33mInfinity�[39m �[33mNaN�[39m �[90mundefined�[39m

uglified result:
�[1mnull�[22m �[33m109�[39m �[33m-1�[39m �[33m95�[39m �[33mInfinity�[39m �[33mNaN�[39m �[90mundefined�[39m

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