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<?php /** * @param mixed[] $a */ function test(array $a): void { if (isset($a['a']['b'])) { echo 'OK'; } } class Foo { } test(['a' => new Foo()]);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot use object of type Foo as array in /in/RegCt:8 Stack trace: #0 /in/RegCt(18): test(Array) #1 {main} thrown in /in/RegCt on line 8
Process exited with code 255.

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