anchor.diff:  classBodyStmt: visibilityStmt
       | annotations? propertyDecl
       | structOrClassField
  -    | procMethodDecl
  +    | procOrMethodDecl
       | STATIC_IF boolExpr THEN classBodyStmt* (ELSE classBodyStmt*)? END_IF
       ;
   
  
positive.code:     END_INTERFACE
      ;
  
  interfaceBodyStmt: procMethodDecl
      | STATIC_IF boolExpr THEN interfaceBodyStmt* (ELSE interfaceBodyStmt*)? END_IF
      ;
  
  
negative.code: 
  
  globalDecl: constDecl
      | procDecl
      | typeDecl
      | visibilityStmt
      | varDecl
  