[E019] Error: case `A\B\C\D\E\Foo::Baz` of unit enum `Foo` cannot have a value
   ,-[code.php:7:15]
   |
 5 | enum Foo {
   *      ^^^  
   *            
   * 
 7 |      case Baz = 2;
   *           ^^^ |  
   *               `-- try replacing this with `;`
   *                  
   *                   
---'