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<?hh (($v)==> {echo $v;})(1);
based on sespY
Output for hhvm-3.12.0
1
Output for hhvm-3.10.0

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