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<?hh echo (call_user_func(($x) ==> $x + 1) )(3);
based on lE04B
Output for 5.4.34
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /in/jSsQf on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh echo (call_user_func(($x) ==> $x + 1) )(3);