ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr: funct [0/0] {1}                              
     ¦--FUNCTION: funct [0/2] {2}                      
     ¦--'(': ( [0/0] {3}                               
     ¦--SYMBOL_FORMALS: x [0/0] {4}                    
     ¦--',': , [0/1] {5}                               
     ¦--SYMBOL_FORMALS: y [0/0] {6}                    
     ¦--',': , [0/1] {7}                               
     ¦--SYMBOL_FORMALS: z [0/0] {8}                    
     ¦--')': ) [0/1] {9}                               
     °--expr: {
  3 [0/0] {10}                        
         ¦--'{': { [0/2] {11}                          
         ¦--expr: 3 + 1 [1/0] {12}                     
         ¦   ¦--expr: 3 [0/1] {14}                     
         ¦   ¦   °--NUM_CONST: 3 [0/0] {13}            
         ¦   ¦--'+': + [0/1] {15}                      
         ¦   °--expr: 1 [0/0] {17}                     
         ¦       °--NUM_CONST: 1 [0/0] {16}            
         °--'}': } [1/0] {18}                          
