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<?php interface Foo { public function bar(): string; } class Test implements Foo { public function bar() { return new StdClass; } } $t = new Test; var_dump($t->bar());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Test::bar() must be compatible with Foo::bar(): string in /in/B9gSr on line 8
Process exited with code 255.

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