code: public PExp caseABooleanPattern(ABooleanPattern node)
  			throws AnalysisException
  	{
  		ABooleanConstExp b = new ABooleanConstExp();
  		b.setValue(node.getValue().clone());
  		addPossibleType(b, node);
  		return b;
  	}
docs: First, literal patterns convert to expressions easily:
  
  @param node
  @return
  @throws AnalysisException