public void addAll(ExceptionSet other){
  exceptionSet.or(other.exceptionSet);
  explicitSet.or(other.explicitSet);
  size=countBits(exceptionSet);
  commonSupertype=null;
}

public void addAll ( ExceptionSet other ) { exceptionSet . or ( other . exceptionSet ) ; explicitSet . or ( other . explicitSet ) ; size = countBits ( exceptionSet ) ; commonSupertype = null ; }
add all exceptions in the given set .
