anchor.diff:  // R410
   sign : 
    PLUS 
  -| 
  +| MINUS
   ;
   // R413
   octalConstant : 
  
positive.code: // R1231
  subroutineSubprogram : 
  subroutineStmt
    (   specificationPart   )?  
    (   executionPart   )?  
    (   internalSubprogramPart   )?  
  endSubroutineStmt
  ;
  // R1230
  
negative.code: // R1223
  functionSubprogram : 
  functionStmt
    specificationPart
    executionPart
    internalSubprogramPart
  endFunctionStmt
  ;
  // R1224
  