ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr:  [0/0] {1}                                   
     ¦--expr:  [0/0] {3}                               
     ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {2}       
     ¦--'(': ( [0/0] {4}                               
     °--')': ) [0/0] {5}                               
