ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr: call( [0/0] {1}                              
 ¦   ¦--expr: call [0/0] {3}                           
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {2}       
 ¦   ¦--'(': ( [0/0] {4}                               
 ¦   ¦--SYMBOL_SUB: a [0/1] {5}                        
 ¦   ¦--EQ_SUB: = [0/7] {6}                            
 ¦   ¦--expr: 5 [1/0] {8}                              
 ¦   ¦   °--NUM_CONST: 5 [0/0] {7}                     
 ¦   ¦--',': , [0/5] {9}                               
 ¦   ¦--expr: b [1/0] {11}                             
 ¦   ¦   °--SYMBOL: b [0/0] {10}                       
 ¦   °--')': ) [0/0] {12}                              
 ¦--expr: call( [2/0] {13}                             
 ¦   ¦--expr: call [0/0] {15}                          
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {14}      
 ¦   ¦--'(': ( [0/0] {16}                              
 ¦   ¦--SYMBOL_SUB: a [0/1] {17}                       
 ¦   ¦--EQ_SUB: = [0/7] {18}                           
 ¦   ¦--expr: 5 [1/0] {20}                             
 ¦   ¦   °--NUM_CONST: 5 [0/0] {19}                    
 ¦   ¦--',': , [0/5] {21}                              
 ¦   ¦--expr: b [1/5] {23}                             
 ¦   ¦   °--SYMBOL: b [0/0] {22}                       
 ¦   °--')': ) [1/0] {24}                              
 °--expr: c(
   [2/0] {25}                            
     ¦--expr: c [0/0] {27}                             
     ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {26}         
     ¦--'(': ( [0/8] {28}                              
     ¦--SYMBOL_SUB: a [1/1] {29}                       
     ¦--EQ_SUB: = [0/16] {30}                          
     ¦--expr: 1 [1/0] {32}                             
     ¦   °--NUM_CONST: 1 [0/0] {31}                    
     ¦--',': , [0/8] {33}                              
     ¦--SYMBOL_SUB: b [1/1] {34}                       
     ¦--EQ_SUB: = [0/1] {35}                           
     ¦--COMMENT: # com [0/16] {36}                     
     ¦--expr: 2 [1/0] {38}                             
     ¦   °--NUM_CONST: 2 [0/0] {37}                    
     °--')': ) [1/0] {39}                              
