ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr: x <-
 [0/0] {1}                             
 ¦   ¦--expr: x [0/1] {3}                              
 ¦   ¦   °--SYMBOL: x [0/0] {2}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {4}                      
 ¦   °--expr: 2 [1/0] {6}                              
 ¦       °--NUM_CONST: 2 [0/0] {5}                     
 ¦--expr: x <-  [3/0] {7}                              
 ¦   ¦--expr: x [0/1] {9}                              
 ¦   ¦   °--SYMBOL: x [0/0] {8}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {10}                     
 ¦   °--expr: 3 [0/0] {12}                             
 ¦       °--NUM_CONST: 3 [0/0] {11}                    
 ¦--COMMENT: # FIX [2/0] {13}                          
 ¦--COMMENT: # not [1/0] {14}                          
 ¦--expr: x <-
 [1/0] {15}                            
 ¦   ¦--expr: x [0/1] {17}                             
 ¦   ¦   °--SYMBOL: x [0/0] {16}                       
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {18}                     
 ¦   ¦--COMMENT: # the [1/2] {19}                      
 ¦   °--expr: 3 [2/0] {21}                             
 ¦       °--NUM_CONST: 3 [0/0] {20}                    
 ¦--expr_or_assign_or_help: x = # [3/0] {22}           
 ¦   ¦--expr: x [0/1] {24}                             
 ¦   ¦   °--SYMBOL: x [0/0] {23}                       
 ¦   ¦--EQ_ASSIGN: = [0/1] {25}                        
 ¦   ¦--COMMENT: # [0/2] {26}                          
 ¦   °--expr: 2 [1/0] {28}                             
 ¦       °--NUM_CONST: 2 [0/0] {27}                    
 ¦--expr_or_assign_or_help: x = 3 [3/0] {29}           
 ¦   ¦--expr: x [0/1] {31}                             
 ¦   ¦   °--SYMBOL: x [0/0] {30}                       
 ¦   ¦--EQ_ASSIGN: = [0/1] {32}                        
 ¦   °--expr: 3 [0/0] {34}                             
 ¦       °--NUM_CONST: 3 [0/0] {33}                    
 ¦--expr_or_assign_or_help: x =

 [2/0] {35}         
 ¦   ¦--expr: x [0/1] {37}                             
 ¦   ¦   °--SYMBOL: x [0/0] {36}                       
 ¦   ¦--EQ_ASSIGN: = [0/2] {38}                        
 ¦   ¦--COMMENT: # com [2/2] {39}                      
 ¦   °--expr: 3 [1/0] {41}                             
 ¦       °--NUM_CONST: 3 [0/0] {40}                    
 ¦--expr: Impor [4/0] {42}                             
 ¦   ¦--expr: Impor [0/1] {43}                         
 ¦   ¦   ¦--expr: Impor [0/0] {45}                     
 ¦   ¦   ¦   °--SYMBOL: Impor [0/0] {44}               
 ¦   ¦   ¦--'$': $ [0/0] {46}                          
 ¦   ¦   °--SYMBOL: Impor [0/0] {47}                   
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {48}                     
 ¦   ¦--expr: Impor [1/1] {50}                         
 ¦   ¦   ¦--expr: Impor [0/0] {52}                     
 ¦   ¦   ¦   °--SYMBOL: Impor [0/0] {51}               
 ¦   ¦   ¦--'$': $ [0/0] {53}                          
 ¦   ¦   °--SYMBOL: Impor [0/0] {54}                   
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {55}                     
 ¦   °--expr: Compl [1/0] {56}                         
 ¦       ¦--expr: Compl [0/0] {58}                     
 ¦       ¦   °--SYMBOL_FUNCTION_CALL: Compl [0/0] {57} 
 ¦       ¦--'(': ( [0/0] {59}                          
 ¦       ¦--expr: Impor [0/0] {60}                     
 ¦       ¦   ¦--expr: Impor [0/0] {62}                 
 ¦       ¦   ¦   °--SYMBOL: Impor [0/0] {61}           
 ¦       ¦   ¦--'$': $ [0/0] {63}                      
 ¦       ¦   °--SYMBOL: Input [0/0] {64}               
 ¦       °--')': ) [0/0] {65}                          
 ¦--expr: Impor [3/0] {66}                             
 ¦   ¦--expr: Impor [0/1] {67}                         
 ¦   ¦   ¦--expr: Impor [0/0] {69}                     
 ¦   ¦   ¦   °--SYMBOL: Impor [0/0] {68}               
 ¦   ¦   ¦--'$': $ [0/0] {70}                          
 ¦   ¦   °--SYMBOL: Impor [0/0] {71}                   
 ¦   ¦--LEFT_ASSIGN: <- [0/2] {72}                     
 ¦   ¦--expr: Impor [1/1] {74}                         
 ¦   ¦   ¦--expr: Impor [0/0] {76}                     
 ¦   ¦   ¦   °--SYMBOL: Impor [0/0] {75}               
 ¦   ¦   ¦--'$': $ [0/0] {77}                          
 ¦   ¦   °--SYMBOL: Impor [0/0] {78}                   
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {79}                     
 ¦   °--expr: Compl [0/0] {80}                         
 ¦       ¦--expr: Compl [0/0] {82}                     
 ¦       ¦   °--SYMBOL_FUNCTION_CALL: Compl [0/0] {81} 
 ¦       ¦--'(': ( [0/0] {83}                          
 ¦       ¦--expr: Impor [0/0] {84}                     
 ¦       ¦   ¦--expr: Impor [0/0] {86}                 
 ¦       ¦   ¦   °--SYMBOL: Impor [0/0] {85}           
 ¦       ¦   ¦--'$': $ [0/0] {87}                      
 ¦       ¦   °--SYMBOL: Input [0/0] {88}               
 ¦       °--')': ) [0/0] {89}                          
 °--expr: Impor [4/0] {90}                             
     ¦--expr: Impor [0/1] {91}                         
     ¦   ¦--expr: Impor [0/0] {93}                     
     ¦   ¦   °--SYMBOL: Impor [0/0] {92}               
     ¦   ¦--'$': $ [0/0] {94}                          
     ¦   °--SYMBOL: Impor [0/0] {95}                   
     ¦--LEFT_ASSIGN: <- [0/2] {96}                     
     ¦--expr: Impor [2/1] {98}                         
     ¦   ¦--expr: Impor [0/0] {100}                    
     ¦   ¦   °--SYMBOL: Impor [0/0] {99}               
     ¦   ¦--'$': $ [0/0] {101}                         
     ¦   °--SYMBOL: Impor [0/0] {102}                  
     ¦--LEFT_ASSIGN: <- [0/1] {103}                    
     °--expr: Compl [0/0] {104}                        
         ¦--expr: Compl [0/0] {106}                    
         ¦   °--SYMBOL_FUNCTION_CALL: Compl [0/0] {105}
         ¦--'(': ( [0/0] {107}                         
         ¦--expr: Impor [0/0] {108}                    
         ¦   ¦--expr: Impor [0/0] {110}                
         ¦   ¦   °--SYMBOL: Impor [0/0] {109}          
         ¦   ¦--'$': $ [0/0] {111}                     
         ¦   °--SYMBOL: Input [0/0] {112}              
         °--')': ) [0/0] {113}                         
