ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr: x <-
 [0/0] {1}                             
 ¦   ¦--expr: x [0/1] {3}                              
 ¦   ¦   °--SYMBOL: x [0/0] {2}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {4}                      
 ¦   °--expr: 2 [1/0] {6}                              
 ¦       °--NUM_CONST: 2 [0/0] {5}                     
 ¦--expr: x <-  [3/0] {7}                              
 ¦   ¦--expr: x [0/1] {9}                              
 ¦   ¦   °--SYMBOL: x [0/0] {8}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {10}                     
 ¦   °--expr: 3 [0/0] {12}                             
 ¦       °--NUM_CONST: 3 [0/0] {11}                    
 ¦--COMMENT: # FIX [2/0] {13}                          
 ¦--COMMENT: # not [1/0] {14}                          
 ¦--expr: x <-
 [1/0] {15}                            
 ¦   ¦--expr: x [0/1] {17}                             
 ¦   ¦   °--SYMBOL: x [0/0] {16}                       
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {18}                     
 ¦   ¦--COMMENT: # the [1/2] {19}                      
 ¦   °--expr: 3 [2/0] {21}                             
 ¦       °--NUM_CONST: 3 [0/0] {20}                    
 ¦--expr_or_assign_or_help: x = # [3/0] {22}           
 ¦   ¦--expr: x [0/1] {24}                             
 ¦   ¦   °--SYMBOL: x [0/0] {23}                       
 ¦   ¦--EQ_ASSIGN: = [0/1] {25}                        
 ¦   ¦--COMMENT: # [0/2] {26}                          
 ¦   °--expr: 2 [1/0] {28}                             
 ¦       °--NUM_CONST: 2 [0/0] {27}                    
 ¦--expr_or_assign_or_help: x = 3 [3/0] {29}           
 ¦   ¦--expr: x [0/1] {31}                             
 ¦   ¦   °--SYMBOL: x [0/0] {30}                       
 ¦   ¦--EQ_ASSIGN: = [0/1] {32}                        
 ¦   °--expr: 3 [0/0] {34}                             
 ¦       °--NUM_CONST: 3 [0/0] {33}                    
 °--expr_or_assign_or_help: x =

 [2/0] {35}         
     ¦--expr: x [0/1] {37}                             
     ¦   °--SYMBOL: x [0/0] {36}                       
     ¦--EQ_ASSIGN: = [0/2] {38}                        
     ¦--COMMENT: # com [2/2] {39}                      
     °--expr: 3 [1/0] {41}                             
         °--NUM_CONST: 3 [0/0] {40}                    
