docs: public String getLHSBindingType(final String var) {
          if (this.lhs == null) {
              return null;
          }
          for (int i = 0; i < this.lhs.length; i++) {
              String type = getLHSBindingType(this.lhs[i],
                                              var);
              if (type != null) {
                  return type;
              }
          }
          return null;
      }