Uglify.Js hangs permanently

[Metalnem]

Uglify.Js can hang permanently with some malformed JS inputs. Here's the full program to reproduce one such case:

using System.IO;

namespace NUglify.Run
{
  public class Program
  {
    public static void Main(string[] args)
    {
      Uglify.Js("switch=1) eval('1');");
    }
  }
}

Found via SharpFuzz.