yes , the different run( ) is the same function , and now the fatal error col nil disappears automatically when implement, but i do not know why disappears.
                    
                  
                
              
              
                
                Topic:
                  
	
		Developer Tools & Services
  	
                
                
                SubTopic:
                  
                    
	
		Xcode
		
  	
                  
                
              
              
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