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run code in 150+ php & hhvm versions
Bugs & Features
<?hh $i: int = 1; $s: string = 'test' . (string) $i; echo $s;
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.4.32
<?hh $i: int = 1; $s: string = 'test' . (string) $i; echo $s;