ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--COMMENT: #' Th [0/0] {1}                           
 ¦--COMMENT: #' [1/0] {2}                              
 ¦--COMMENT: #' St [1/0] {3}                           
 ¦--COMMENT: #' @f [1/0] {4}                           
 ¦--COMMENT: #' @e [1/0] {5}                           
 ¦--COMMENT: #' st [1/0] {6}                           
 ¦--COMMENT: #' st [1/0] {7}                           
 ¦--COMMENT: #' st [1/0] {8}                           
 ¦--COMMENT: #' st [1/0] {9}                           
 ¦--expr: a <-  [1/0] {10}                             
 ¦   ¦--expr: a [0/1] {12}                             
 ¦   ¦   °--SYMBOL: a [0/0] {11}                       
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {13}                     
 ¦   °--expr: call [0/0] {15}                          
 ¦       °--SYMBOL: call [0/0] {14}                    
 ¦--COMMENT: #' Pr [2/0] {16}                          
 ¦--COMMENT: #' [1/0] {17}                             
 ¦--COMMENT: #' Pe [1/0] {18}                          
 ¦--COMMENT: #' (c [1/0] {19}                          
 ¦--COMMENT: #' Ca [1/0] {20}                          
 ¦--COMMENT: #' @e [1/0] {21}                          
 °--expr: a <-  [1/0] {22}                             
     ¦--expr: a [0/1] {24}                             
     ¦   °--SYMBOL: a [0/0] {23}                       
     ¦--LEFT_ASSIGN: <- [0/3] {25}                     
     °--expr: 2 [0/0] {27}                             
         °--NUM_CONST: 2 [0/0] {26}                    
