ROOT (token: short_text [lag_newlines/spaces] {id})
 ¦--expr:  [0/1] {55}                              
 ¦   ¦--expr:  [0/0] {3}                           
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {1}   
 ¦   ¦--'(': ( [0/2] {2}                           
 ¦   ¦--expr:  [1/0] {7}                           
 ¦   ¦   °--SYMBOL: engin [0/0] {5}                
 ¦   ¦--',': , [0/2] {6}                           
 ¦   ¦--SYMBOL_SUB: xetex [1/1] {11}               
 ¦   ¦--EQ_SUB: = [0/1] {12}                       
 ¦   ¦--expr:  [0/0] {22}                          
 ¦   ¦   ¦--'{': { [0/9] {13}                      
 ¦   ¦   ¦--expr:  [1/7] {17}                      
 ¦   ¦   ¦   °--SYMBOL: x [0/0] {15}               
 ¦   ¦   °--'}': } [1/0] {20}                      
 ¦   ¦--',': , [0/7] {23}                          
 ¦   ¦--SYMBOL_SUB: luate [1/0] {27}               
 ¦   ¦--EQ_SUB: = [0/1] {28}                       
 ¦   ¦--expr:  [0/0] {38}                          
 ¦   ¦   ¦--'{': { [0/7] {29}                      
 ¦   ¦   ¦--expr:  [1/7] {33}                      
 ¦   ¦   ¦   °--SYMBOL: x [0/0] {31}               
 ¦   ¦   °--'}': } [1/0] {36}                      
 ¦   ¦--',': , [0/0] {39}                          
 ¦   ¦--expr:  [0/1] {51}                          
 ¦   ¦   ¦--'{': { [0/3] {42}                      
 ¦   ¦   ¦--expr:  [1/2] {46}                      
 ¦   ¦   ¦   °--SYMBOL: xx [0/0] {44}              
 ¦   ¦   °--'}': } [1/0] {49}                      
 ¦   °--')': ) [0/0] {52}                          
 °--COMMENT: # FIX [0/0] {56}                      
