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<?php spl_autoload_register(function () { var_dump(func_get_args()); }); try { new Foo(); } catch(Throwable $t) { var_dump($t); } if (true) { class Foo {} var_dump(new Foo()); }
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(3) "Foo" } object(Error)#2 (7) { ["message":protected]=> string(21) "Class "Foo" not found" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/iSXM2" ["line":protected]=> int(8) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL } object(Foo)#3 (0) { }

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