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