code: public boolean setLocalVariable(Object key, Object value) {
  		boolean success = false;
  
  		if (working.size() > 0) {
  			Map<Object, Object> map = working.get(working.size() - 1);
  			map.put(key, value);
  			success = true;
  		}
  		return success;
  	}
docs: set a new local variable, on the highest block hierarchy.
  
  @param key
  name of the variable
  @param value
  value of the variable
  @return true if at least one local block hierarchy exists else false