ROOT (token: short_text [lag_newlines/spaces] {pos_id})    
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    [1/0] {300}                           
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 ¦   ¦--expr: {{ y} [0/0] {364}                            
 ¦   ¦   ¦--'{': { [0/0] {365}                             
 ¦   ¦   ¦--expr: { y} [0/0] {366}                         
 ¦   ¦   ¦   ¦--'{': { [0/1] {367}                         
 ¦   ¦   ¦   ¦--expr: y [0/0] {369}                        
 ¦   ¦   ¦   ¦   °--SYMBOL: y [0/0] {368}                  
 ¦   ¦   ¦   °--'}': } [0/0] {370}                         
 ¦   ¦   °--'}': } [0/0] {371}                             
 ¦   °--')': ) [0/0] {372}                                 
 ¦--expr: call( [1/0] {373}                                
 ¦   ¦--expr: call [0/0] {375}                             
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {374}         
 ¦   ¦--'(': ( [0/0] {376}                                 
 ¦   ¦--expr: {{ x  [0/0] {377}                            
 ¦   ¦   ¦--'{': { [0/0] {378}                             
 ¦   ¦   ¦--expr: { x } [0/0] {379}                        
 ¦   ¦   ¦   ¦--'{': { [0/1] {380}                         
 ¦   ¦   ¦   ¦--expr: x [0/1] {382}                        
 ¦   ¦   ¦   ¦   °--SYMBOL: x [0/0] {381}                  
 ¦   ¦   ¦   °--'}': } [0/0] {383}                         
 ¦   ¦   °--'}': } [0/0] {384}                             
 ¦   ¦--',': , [0/1] {385}                                 
 ¦   ¦--expr: {{ y} [0/0] {386}                            
 ¦   ¦   ¦--'{': { [0/0] {387}                             
 ¦   ¦   ¦--expr: { y} [0/2] {388}                         
 ¦   ¦   ¦   ¦--'{': { [0/1] {389}                         
 ¦   ¦   ¦   ¦--expr: y [0/0] {391}                        
 ¦   ¦   ¦   ¦   °--SYMBOL: y [0/0] {390}                  
 ¦   ¦   ¦   °--'}': } [0/0] {392}                         
 ¦   ¦   °--'}': } [1/0] {393}                             
 ¦   °--')': ) [0/0] {394}                                 
 ¦--expr: call( [1/0] {395}                                
 ¦   ¦--expr: call [0/0] {397}                             
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {396}         
 ¦   ¦--'(': ( [0/2] {398}                                 
 ¦   ¦--expr: {{ x  [1/0] {399}                            
 ¦   ¦   ¦--'{': { [0/0] {400}                             
 ¦   ¦   ¦--expr: { x } [0/0] {401}                        
 ¦   ¦   ¦   ¦--'{': { [0/1] {402}                         
 ¦   ¦   ¦   ¦--expr: x [0/1] {404}                        
 ¦   ¦   ¦   ¦   °--SYMBOL: x [0/0] {403}                  
 ¦   ¦   ¦   °--'}': } [0/0] {405}                         
 ¦   ¦   °--'}': } [0/0] {406}                             
 ¦   ¦--',': , [0/1] {407}                                 
 ¦   ¦--expr: {{ y} [0/0] {408}                            
 ¦   ¦   ¦--'{': { [0/0] {409}                             
 ¦   ¦   ¦--expr: { y} [0/0] {410}                         
 ¦   ¦   ¦   ¦--'{': { [0/1] {411}                         
 ¦   ¦   ¦   ¦--expr: y [0/0] {413}                        
 ¦   ¦   ¦   ¦   °--SYMBOL: y [0/0] {412}                  
 ¦   ¦   ¦   °--'}': } [0/0] {414}                         
 ¦   ¦   °--'}': } [0/0] {415}                             
 ¦   °--')': ) [0/0] {416}                                 
 °--expr: call( [2/0] {417}                                
     ¦--expr: call [0/0] {419}                             
     ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {418}         
     ¦--'(': ( [0/2] {420}                                 
     ¦--expr: {{ x  [1/0] {421}                            
     ¦   ¦--'{': { [0/0] {422}                             
     ¦   ¦--expr: { x } [0/0] {423}                        
     ¦   ¦   ¦--'{': { [0/1] {424}                         
     ¦   ¦   ¦--expr: x [0/1] {426}                        
     ¦   ¦   ¦   °--SYMBOL: x [0/0] {425}                  
     ¦   ¦   °--'}': } [0/0] {427}                         
     ¦   °--'}': } [0/0] {428}                             
     ¦--',': , [0/2] {429}                                 
     ¦--expr: {{ y} [1/0] {430}                            
     ¦   ¦--expr: {{ y} [0/1] {431}                        
     ¦   ¦   ¦--'{': { [0/0] {432}                         
     ¦   ¦   ¦--expr: { y} [0/0] {433}                     
     ¦   ¦   ¦   ¦--'{': { [0/1] {434}                     
     ¦   ¦   ¦   ¦--expr: y [0/0] {436}                    
     ¦   ¦   ¦   ¦   °--SYMBOL: y [0/0] {435}              
     ¦   ¦   ¦   °--'}': } [0/0] {437}                     
     ¦   ¦   °--'}': } [0/0] {438}                         
     ¦   ¦--LEFT_ASSIGN: := [0/1] {439}                    
     ¦   °--expr: 3 [0/0] {441}                            
     ¦       °--NUM_CONST: 3 [0/0] {440}                   
     ¦--',': , [0/1] {442}                                 
     ¦--expr: f(bk) [0/0] {443}                            
     ¦   ¦--expr: f [0/0] {445}                            
     ¦   ¦   °--SYMBOL_FUNCTION_CALL: f [0/0] {444}        
     ¦   ¦--'(': ( [0/0] {446}                             
     ¦   ¦--expr: bk [0/0] {448}                           
     ¦   ¦   °--SYMBOL: bk [0/0] {447}                     
     ¦   °--')': ) [0/0] {449}                             
     °--')': ) [1/0] {450}                                 
