src/common/fast-path.js/isLeftOfAForStatement
      const isLeftOfAForStatement = node => {
        let i = 0;
        while (node) {
          const parent = this.getParentNode(i++);
          if (!parent) {
            return false;
          }
          if (parent.type === "ForStatement" && parent.init === node) {
            return true;
          }
          node = parent;
        }
        return false;
      };