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Bugs & Features
<?php class User {} class Baby extends User {} interface UserGateway { function find($id): User; } class UserGateway_MySql implements UserGateway { // must return User or subtype of User function find($id) { return new User(); } }

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Output for Arrow functions
Fatal error: Declaration of UserGateway_MySql::find($id) must be compatible with UserGateway::find($id): User in /in/1upNP on line 10

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