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run code in 150+ php & hhvm versions
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<?hh function a():int { return 1.1; } a();
based on hNDfI
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/g1O1c on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh function a():int { return 1.1; } a();