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<?hh class Foo { function get(): ?int { static $called = false; if (!$called) { $called = true; return 42; } return null; } } function doStuff(Foo $foo) { var_dump($foo->get() ? $foo->get() : 'was null the first time'); } doStuff(new Foo());
Output for git.master, git.master_jit, rfc.property-hooks
<?hh class Foo { function get(): ?int { static $called = false; if (!$called) { $called = true; return 42; } return null; } } function doStuff(Foo $foo) { var_dump($foo->get() ? $foo->get() : 'was null the first time'); } doStuff(new Foo());

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