anchor.diff:    programStmt  
     specificationPart  
     executionPart  
  -  internalSubprogramPart  
  +  (internalSubprogramPart)?
   endProgramStmt
   ;
   // R1103
  
positive.code: functionStmt
    specificationPart
    executionPart
    internalSubprogramPart
  endFunctionStmt
  ;
  // R1224
  
negative.code: subroutineStmt
    specificationPart 
    executionPart
    (internalSubprogramPart)?
  endSubroutineStmt
  ;
  // R1230
  