The debug class loader is always loaded by Debug::enable().

derrabus · derrabus · commit d1f41601f4c2 · 2018-06-22T17:01:26.000+02:00
diff --git a/src/Symfony/Component/Debug/Debug.php b/src/Symfony/Component/Debug/Debug.php
@@ -23,10 +23,7 @@ class Debug
     /**
      * Enables the debug tools.
      *
-     * This method registers an error handler and an exception handler.
-     *
-     * If the Symfony ClassLoader component is available, a special
-     * class loader is also registered.
+     * This method registers an error handler, an exception handler and a special class loader.
      *
      * @param int  $errorReportingLevel The level of error reporting you want
      * @param bool $displayErrors       Whether to display errors (for development) or just log them (for production)

Original file line number	Diff line number	Diff line change
`@@ -23,10 +23,7 @@ class Debug`
`23`	`23`	`/**`
`24`	`24`	`* Enables the debug tools.`
`25`	`25`	`*`
`26`		`- * This method registers an error handler and an exception handler.`
`27`		`- *`
`28`		`- * If the Symfony ClassLoader component is available, a special`
`29`		`- * class loader is also registered.`
	`26`	`+ * This method registers an error handler, an exception handler and a special class loader.`
`30`	`27`	`*`
`31`	`28`	`* @param int $errorReportingLevel The level of error reporting you want`
`32`	`29`	`* @param bool $displayErrors Whether to display errors (for development) or just log them (for production)`