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<?hh class C { public function __toString() { return ""; } } function f(string $s) { } f(new C());
based on sVlCd
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/Hq3mU on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh class C { public function __toString() { return ""; } } function f(string $s) { } f(new C());