throws Throwable
throws IOException
    public void varDumpImpl(Env env,                            WriteStream out,                            int depth,                            IdentityHashMap<Value, String> valueSet)      throws Throwable    {      printDepth(out, 2 * depth);      out.print("[");      if (_key instanceof StringValue)        out.print("\"" + _key + "\"");      else        out.print(_key);      out.println("]=>");      printDepth(out, 2 * depth);      _value.varDump(env, out, depth, valueSet);    }