ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr: q <-  [0/0] {1}                              
     ¦--expr: q [0/1] {3}                              
     ¦   °--SYMBOL: q [0/0] {2}                        
     ¦--LEFT_ASSIGN: <- [0/2] {4}                      
     ¦--expr: a [0/0] {9}                              
     ¦   °--SYMBOL: a [0/0] {8}                        
     ¦--'+': + [0/2] {10}                              
     ¦--expr: - 3 [1/1] {11}                           
     ¦   ¦--'-': - [0/1] {12}                          
     ¦   °--expr: 3 [0/0] {14}                         
     ¦       °--NUM_CONST: 3 [0/0] {13}                
     ¦--'+': + [0/0] {15}                              
     ¦--expr: 2 [1/0] {17}                             
     ¦   °--NUM_CONST: 2 [0/0] {16}                    
     ¦--'+': + [0/0] {18}                              
     ¦--expr: g() [1/0] {20}                           
     ¦   ¦--expr: g [0/0] {22}                         
     ¦   ¦   °--SYMBOL_FUNCTION_CALL: g [0/0] {21}     
     ¦   ¦--'(': ( [0/0] {23}                          
     ¦   °--')': ) [0/0] {24}                          
     ¦--SPECIAL-PIPE: %>% [0/3] {25}                   
     °--expr: k() [1/0] {26}                           
         ¦--expr: k [0/0] {28}                         
         ¦   °--SYMBOL_FUNCTION_CALL: k [0/0] {27}     
         ¦--'(': ( [0/0] {29}                          
         °--')': ) [0/0] {30}                          
