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run code in 300+ PHP versions simultaneously
<?php interface I1 { public function fromThing(ThingA $thing): I1; } interface I2 { public function fromThing(ThingB $thing): I2; } class ThingA {} class ThingB {} class Impl implements I1, I2 { public function fromThing(ThingA|ThingB $thing): I1&I2 { return new self(); } } $i = new Impl();
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