php-8.0.30-src/Zend/tests/generators/yield_array_key.phpt

--TEST--
Array keys can be yielded from generators
--FILE--
<?php

function gen() {
    yield [] => 1;
}

$gen = gen();
var_dump($gen->key());
var_dump($gen->current());

?>
--EXPECT--
array(0) {
}
int(1)