[ErrorHandler] Avoid compile crash while trying to find candidate when a class is not found

Author: lyrixx

ErrorEnhancer/ClassNotFoundErrorEnhancer.php

@@ -152,6 +152,14 @@ private function convertFileToClass(string $path, string $file, string $prefix):
             }
         }
 
+        // Symfony may ship some polyfills, like "Normalizer". But if the Intl
+        // extension is already installed, the next require_once will fail with
+        // a compile error because the class is already defined. And this one
+        // does not throw a Throwable. So it's better to skip it here.
+        if (str_contains($file, 'Resources/stubs')) {
+            return null;
+        }
+
         try {
             require_once $file;
         } catch (\Throwable) {