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<?hh // strict class Foo { public function __construct() { $args = func_get_args(); foreach ($args as $i => $j) { $this->$i = $j; } } } $foo = new Foo(["a" => "b"]);
based on R3GvF
Output for hhvm-3.12.0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/bJ6Yo on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh // strict class Foo { public function __construct() { $args = func_get_args(); foreach ($args as $i => $j) { $this->$i = $j; } } } $foo = new Foo(["a" => "b"]);