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<?hh var_dump((($v)==> $v)(4)));
based on r4DX2
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'var_dump' (T_STRING) in /in/JSNOZ on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh var_dump((($v)==> $v)(4)));