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run code in 200+ php & hhvm versions
<?php interface AggregateRoot {} class Customer implements AggregateRoot {} interface AggregateRootFactory { public function create() : AggregateRoot; } class CustomerFactory implements AggregateRootFactory { public function create() : Customer // Customer is subtype of AggregateRoot, it should work { return new Customer(); } } $factory = new CustomerFactory(); $customer = $factory->create();
based on oiLsv
Output for 7.0.0 - 7.3.1
Fatal error: Declaration of CustomerFactory::create(): Customer must be compatible with AggregateRootFactory::create(): AggregateRoot in /in/MgU9b on line 14
Process exited with code 255.
Output for hhvm-3.13.2
Output for 5.6.0 - 5.6.25
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/MgU9b on line 11
Process exited with code 255.