anchor.diff:  // R1104
   module : 
   moduleStmt
  -  (   specificationPart   )?  
  -  (   moduleSubprogramPart   )?  
  +  specificationPart
  +  moduleSubprogramPart
   endModuleStmt
   ;
   // R1107
  
positive.code: ;
  // R1101
  mainProgram : 
    (   programStmt   )?  
    (   specificationPart   )?  
    (   executionPart   )?  
    (   internalSubprogramPart   )?  
  endProgramStmt
  ;
  // R1103
  
negative.code: // R1205
  interfaceBody : 
  functionStmt
    specificationPart
  endFunctionStmt
  | subroutineStmt
    specificationPart
  endSubroutineStmt
  ;
  // R636
  