anchor.diff:      // files can only have the name index.html/main.dart/styles.css
       if (!files.every((file) {
         var path = file.path;
  -      return path.endsWith('index.html') ||
  -          path.endsWith('main.dart') ||
  -          path.endsWith('styles.css');
  +      return path.endsWith('index.html') || path.endsWith('main.dart') || path.endsWith('styles.css');
       })) {
         print("Skipping ${dirName}: Files can only have the name index.html/main.dart/styles.css.");
         return false;
  
positive.code:         print("Skipping ${dirName}: Dartpads can't import dart:io.");
          return false;
        }
        if (libraries.any((l) => ! l.startsWith('dart:'))) {
          print("Skipping ${dirName}: Dartpads can't import packages.");
          return false;
        }
  
negative.code:     // otherwise dartpadable, yeah :)
      return true;
    }
  }
  