ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr: b <-
 [0/0] {1}                             
 ¦   ¦--expr: b [0/1] {3}                              
 ¦   ¦   °--SYMBOL: b [0/0] {2}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {4}                      
 ¦   °--expr: 3 [1/0] {6}                              
 ¦       °--NUM_CONST: 3 [0/0] {5}                     
 ¦--expr: g <-
 [1/0] {7}                             
 ¦   ¦--expr: g [0/1] {9}                              
 ¦   ¦   °--SYMBOL: g [0/0] {8}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/0] {10}                     
 ¦   °--expr: "v x  [1/0] {12}                         
 ¦       °--STR_CONST: "v x  [0/0] {11}                
 ¦--expr: "'tes [2/0] {14}                             
 ¦   °--STR_CONST: "'tes [0/0] {13}                    
 ¦--expr: 99 +  [1/0] {15}                             
 ¦   ¦--expr: 99 [0/1] {17}                            
 ¦   ¦   °--NUM_CONST: 99 [0/0] {16}                   
 ¦   ¦--'+': + [0/1] {18}                              
 ¦   °--expr: 1 [0/0] {20}                             
 ¦       °--NUM_CONST: 1 [0/0] {19}                    
 ¦--expr: 'test [1/0] {22}                             
 ¦   °--STR_CONST: 'test [0/0] {21}                    
 ¦--expr: 'test [1/1] {24}                             
 ¦   °--STR_CONST: 'test [0/0] {23}                    
 ¦--COMMENT: # com [0/0] {25}                          
 ¦--expr: 1 [1/0] {27}                                 
 ¦   °--NUM_CONST: 1 [0/0] {26}                        
 °--expr: call( [2/0] {28}                             
     ¦--expr: call [0/0] {30}                          
     ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {29}      
     ¦--'(': ( [0/0] {31}                              
     ¦--STR_CONST: "a_is [0/1] {32}                    
     ¦--EQ_SUB: = [0/1] {33}                           
     ¦--expr: 2 [0/0] {35}                             
     ¦   °--NUM_CONST: 2 [0/0] {34}                    
     °--')': ) [0/0] {36}                              
