fix corner case in functions

[alexlamsl]

fixes #4823

[kzc]

I don't think the issue is related to arguments at all. See #4823 (comment).

[alexlamsl]

(sorry for late reply − away for a meal)

So the fundamental issue with v8, as you correctly stated, happens on all variables regardless of name.

The specific issue pertaining to uglify-js is then the principle of GIGO − the following all works without this PR:

console.log(typeof function() {
    {
        function f() {}
        var a = f();
        function g() {}
        var a = g;
    }
    return f && a;
}());

{
    function f() {}
    var a = f();
    function g() {}
    var a = g;
}
console.log(f && a);

[alexlamsl]

Side note: I'm postponing work on pdf.js build testing as it only works on GitHub Actions − which itself has been slowly falling apart in availability/stability over the past months.

Just yesterday email notifications has ceased to function (for which their support has not been helpful thus far). So I can't really justify in implementing anything that has a hard dependency on them.

[kzc]

Makes sense. If you can't debug it, you can't support it.