Here is an example of a PL1TAX source program with errors. Note here that PL1TAX uses the $ symbol as a pointer to the position it can no longer interperate the source statement. Note also that sometimes errors cause other valid statements to be interperated as errors.

@XQT PP.PP  
PL1TAX VER 2  05/28/99 15:00:35 
    
**  PL1TAX PREPROCESSOR  ** 
     #  STATEMENT   
     1. *   
     2. * PP.DEMOERRS - SAMPLE OF PL1TAX SYNTAX ERRORS  
     3. *   
     4. * TABLES - SIMPLE   
     5. *   
     6. *FILES  
     7.  OLD FILE PL1TAXDATA 80 
     8.  OLD FILE DUPE  
         $  
*ERROR   ONLY ONE INPUT/OLD ALLOWED 
     9. 
    10. *UNKNOWN
        $   
*ERROR  CARDS IGNORED UNTIL VALID *CARD 
    11. 
    12. *RECORDS
    13.  V1 
         $  
*ERROR   / EXPECTED 
    14.  V2//   
           $
*ERROR     NUMBER EXPECTED  
    15.  V3//PIC
             $  
*ERROR       NUMBER EXPECTED
    16.  V4//1-Z
               $
*ERROR         NUMBER EXPECTED  
    17.  LASTNAME/LAST NAME/1-12
    18.  FIRSTNAME/FIRST NAME/13-20 
    19.  AGE//21-22 
    20.  RACE//23   
    21.  SEX//24
    22.  SEX//24
         $  
*ERROR   DUPLICATE VARIABLE 
    23.  COUNTY//25-26  
    24.  COMPANY//27-36 
    25.  PHONE//37-46   
    26.  AREACODE/AREA CODE/37-39   
    27.  SSN//47-55 
    28.  SALARY//56-60  
    29. 
    30. *TABLES 
    31.  TABLE  
    32.  STAB SEX CODES M,F 
             $  
*ERROR   INVALID *TABLES COMMAND

    33.  STUB SEX CODES M,F 
    34.  SPREAD AGE GROUPS 00-20,21-65,66-99
    35. 
    36.  TABLE ='SEX VRS AGE',/,='BREAKDOWN',/  
    37.  STUB SEX LABELS MALE,FEMALE
    38.  STUB SEX KODES M,F 
                  $ 
*ERROR            INVALID EXPRESSION

    39.  SPREAD AGE LABELS KIDS,ADULTS,RETIRIES 
    40.  SPREAD AGE GROUPS 00-20,21-65,66-99
    41. 
    42.  TABLE ='COMPANY FREQUENCY LIST'
    43.  STUB COMPANY 100 CODES 
    44. 
    45.  TABLE ='COUNTY BY COMPANY',/   
    46.  STUB COUNTY CODES 01-60
    47.  SPREAD KOMPANY 10 CODES
                $   
*ERROR          UNDEFINED VARIABLE  

    48. 
    49.  TABLE ='COMPANY BY AREA CODE',/
    50.  STUB COMPANY 10 CODES  
    51.  SPREAD AREACODE CODES 222,333,444,555,666,777,888,999  
    52. 
    53.  TABLE ='COMPANY BY AREA CODE',/,   
    54.        ='FOR COUNTIES 50-55'
    55.  SELECT COUNTY EQ 50-55 
    56.  STUB COMPANY 10 CODES  
    57.  SPREAD AREACODE CODES 222,333,444,555,666,777,888,999  
    58. 
    59.  TABLE ='3 DIMENTIONAL TABLE',/,
    60.        ='COMPANY, SEX, BY AGE GROUPS'   
    61.  STUB COMPANY 10 CODES  
    62.  STUB SEX LABELS MALE,FEMALE
    63.  STUB SEX CODES MM,FF   
                        $   
*ERROR                  TOO LONG

    64.  SPREAD AGE LABELS TWENTIES,THIRTIES,FOURTIES,FIFTIES   
    65.  SPREAD AGE GROUPS 20-29,30-39,40-49,50-59  
    66. 
    67. *REPORTS
    68.  REPORT 
    69.  SELEKT AGE = 22
         $  
*ERROR   INVALID *REPORT COMMAND

    70.  LIST COMPANY,2X,LASTNAME,2X,FIRSTNAME  
    71.  SORT COMPANY,LASTNAME,FIRSTNAME
    72. 
    73.  REPORT 
    74.  SELECT AGE = 22
    75.  COMMAND DO NOTHING 
         $  
*ERROR   INVALID *REPORT COMMAND

    76.  LISTAH COMPANY,2X,LASTNAME,2X,FIRSTNAME
    77.  SORT COMPANY,LASTNAME,FIRSTNAME
    78. 
    79.  REPORT ='IBM EMPLOYEE LIST'
    80.  SELECT COMPANY EQ IBM  
    81.  IMAGES 3   
    82.  LIST LASTNAME,2X,FIRSTNAME,2X,PHONE
    83.  SORT LLASTNAME,FIRSTNAME   
              $ 
*ERROR        UNDEFINED VARIABLE

    84. 
    85.  REPORT ='CDC PHONE LIST'   
    86.  SELECT COMPANY EQ CDC  
         $  
*ERROR   CARD IGNORED   

    87.  IMAGES 3   
         $  
*ERROR   CARD IGNORED   

    88.  LISTAH LASTNAME, FIRSTNAME, PHONE  
         $  
*ERROR   CARD IGNORED   

    89.  SORT LASTNAME, FIRSTNAME   
         $  
*ERROR   CARD IGNORED   

    90. 
    91.  REPORT ='HIGHEST PAID EMPLOYEES'   
    92.  SELECT SALARY GT 90000 
    93.  IMAGES 2   
    94.  LISTAH COMPANY, LASTNAME, FIRSTNAME, SALARY
    95.  SORT -SALARY, LASTNAME 
    96. *   

**  PL1TAX FINIS         **   18 ERRORS 

@BK2,E