ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr: 1:10  [0/0] {1}                              
     ¦--expr: 1:10 [0/1] {2}                           
     ¦   ¦--expr: 1 [0/0] {4}                          
     ¦   ¦   °--NUM_CONST: 1 [0/0] {3}                 
     ¦   ¦--':': : [0/0] {5}                           
     ¦   °--expr: 10 [0/0] {7}                         
     ¦       °--NUM_CONST: 10 [0/0] {6}                
     ¦--SPECIAL-PIPE: %>% [0/1] {8}                    
     ¦--COMMENT: # sum [0/2] {9}                       
     °--expr: sum() [1/0] {10}                         
         ¦--expr: sum [0/0] {12}                       
         ¦   °--SYMBOL_FUNCTION_CALL: sum [0/0] {11}   
         ¦--'(': ( [0/0] {13}                          
         °--')': ) [0/0] {14}                          
