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<?php declare(strict_types=1); class Foo implements IteratorAggregate { public function getIterator() { return function() { yield from ['A', 'B', 'C']; yield from ['D', 'E', 'F']; }; } } print_r(iterator_to_array(new Foo()));
Output for git.master_jit, git.master, rfc.property-hooks
Deprecated: Return type of Foo::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/fK1Wh on line 6 Fatal error: Uncaught Exception: Objects returned by Foo::getIterator() must be traversable or implement interface Iterator in /in/fK1Wh:15 Stack trace: #0 /in/fK1Wh(15): iterator_to_array(Object(Foo)) #1 {main} thrown in /in/fK1Wh on line 15
Process exited with code 255.

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