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  }

  function isPoorRelation(node) {
    return node &&
        ((node.type === "(number)" && +node.value === 0) ||
         (node.type === "(string)" && node.value === "") ||
         (node.type === "null" && !state.option.eqnull) ||
        node.type === "true" ||
        node.type === "false" ||
        node.type === "undefined");
  }

  var typeofValues = {};
  typeofValues.legacy = [
    "xml",
    "unknown"
  ];
  typeofValues.es3 = [
    "undefined", "boolean", "number", "string", "function", "object",
  ];
  typeofValues.es3 = typeofValues.es3.concat(typeofValues.legacy);
  typeofValues.es6 = typeofValues.es3.concat("symbol");
  function isTypoTypeof(left, right, state) {
    var values;

    if (state.option.notypeof)
      return false;

    if (!left || !right)
      return false;

    values = state.inES6() ? typeofValues.es6 : typeofValues.es3;

    if (right.type === "(identifier)" && right.value === "typeof" && left.type === "(string)")
      return !_.contains(values, left.value);

    return false;
  }

  function isGlobalEval(left, state) {
    var isGlobal = false;
    if (left.type === "this" && state.funct["(context)"] === null) {
      isGlobal = true;
    }
    else if (left.type === "(identifier)") {
      if (state.option.node && left.value === "global") {
        isGlobal = true;
      }

      else if (state.option.browser && (left.value === "window" || left.value === "document")) {
        isGlobal = true;
      }
    }

    return isGlobal;
  }

  function findNativePrototype(left) {
    var natives = [
      "Array", "ArrayBuffer", "Boolean", "Collator", "DataView", "Date",
      "DateTimeFormat", "Error", "EvalError", "Float32Array", "Float64Array",
      "Function", "Infinity", "Intl", "Int16Array", "Int32Array", "Int8Array",
      "Iterator", "Number", "NumberFormat", "Object", "RangeError",
      "ReferenceError", "RegExp", "StopIteration", "String", "SyntaxError",
      "TypeError", "Uint16Array", "Uint32Array", "Uint8Array", "Uint8ClampedArray",
      "URIError"
    ];

    function walkPrototype(obj) {
      if (typeof obj !== "object") return;
      return obj.right === "prototype" ? obj : walkPrototype(obj.left);
    }

    function walkNative(obj) {
      while (!obj.identifier && typeof obj.left === "object")
        obj = obj.left;

      if (obj.identifier && natives.indexOf(obj.value) >= 0)
        return obj.value;
    }

    var prototype = walkPrototype(left);
    if (prototype) return walkNative(prototype);
  }
  function checkLeftSideAssign(left, assignToken, options) {

    var allowDestructuring = options && options.allowDestructuring;

    assignToken = assignToken || left;

    if (state.option.freeze) {
      var nativeObject = findNativePrototype(left);
      if (nativeObject)
        warning("W121", left, nativeObject);
    }

    if (left.identifier && !left.isMetaProperty) {
      state.funct["(scope)"].block.reassign(left.value, left);
    }

    if (left.id === ".") {
      if (!left.left || left.left.value === "arguments" && !state.isStrict()) {
        warning("E031", assignToken);
      }

      state.nameStack.set(state.tokens.prev);
      return true;
    } else if (left.id === "{" || left.id === "[") {
      if (allowDestructuring && state.tokens.curr.left.destructAssign) {
        state.tokens.curr.left.destructAssign.forEach(function(t) {
          if (t.id) {
            state.funct["(scope)"].block.modify(t.id, t.token);
          }
        });
      } else {
        if (left.id === "{" || !left.left) {
          warning("E031", assignToken);
        } else if (left.left.value === "arguments" && !state.isStrict()) {
          warning("E031", assignToken);
        }
      }