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<?hh function main() { $a = Pair {1, 2}; var_dump(&$a); } main();
based on nb4CN
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'function' (T_FUNCTION) in /in/mg5G3 on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh function main() { $a = Pair {1, 2}; var_dump(&$a); } main();