stack overflow when recover database

stack overflow when recover database.

Check the call stack and find that it has been recursively infinite from Display::fmt -> to_string.

Lines 48 to 52 in abf543b

    
           impl Display for Status { 
        
               fn fmt(&self, fmt: &mut Formatter) -> result::Result<(), fmt::Error> { 
        
                   fmt.write_str(&self.to_string()) 
        
               } 
        
           }

	impl Display for Status {
	fn fmt(&self, fmt: &mut Formatter) -> result::Result<(), fmt::Error> {
	fmt.write_str(&self.to_string())
	}
	}