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<?hh echo (call_user_func((($x) ==> $x + 1), 3));
based on sUcLP
Output for hhvm-3.12.0
4
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /in/Dg28A on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh echo (call_user_func((($x) ==> $x + 1), 3));