[E037] Error: property `Foo::$s` cannot have type `void`
   ,-[code.php:4:12]
   |
 3 | class Foo {
   *       ^^^  
   *             
 4 |     public void $s;
   *            ^^|^ ^^  
   *              |       
   *              |      
   *              `------ try using a different type
   * 
   * Note: `void`, `never`, and `callable` types are not allowed in properties
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