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<?php interface Foo { public function thing(&$foo); } class Bar implements Foo { public function thing($foo) { $foo++; } } $bar = new Bar(); $a = 1; $bar->thing($a); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Bar::thing($foo) must be compatible with Foo::thing(&$foo) in /in/JaFrM on line 6
Process exited with code 255.

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