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<?php spl_autoload_register(function() { var_dump(func_get_args()); }); class Foo {} class Bar extends Foo {} class FooCreator { public function create(FooAlias $foo) { } } $foo = new Bar; $creator = new FooCreator(); $creator->create($foo); class_alias('Foo', 'FooAlias');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: FooCreator::create(): Argument #1 ($foo) must be of type FooAlias, Bar given, called in /in/YADGm on line 23 and defined in /in/YADGm:13 Stack trace: #0 /in/YADGm(23): FooCreator->create(Object(Bar)) #1 {main} thrown in /in/YADGm on line 13
Process exited with code 255.

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