@Override
      public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Variable variable = (Variable)o;

        if (lineNumber != variable.lineNumber) return false;
        if (!name.equals(variable.name)) return false;

        return true;
      }
@Override
      public boolean equals(Object o)