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<?php #[Attribute] readonly class Foo { public function __construct(public Closure $callable) {} } // Allowed #[Foo(static function () {})] class Example {} // Not allowed #[Foo(static fn () => null)] class Example2 {}
Output for 8.5.2
Fatal error: Constant expression contains invalid operations in /in/O0dN8 on line 17 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.4.17
Fatal error: Constant expression contains invalid operations in /in/O0dN8 on line 12
Process exited with code 255.
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