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<?php class Foo { public function doFoo(int &$e) { try { throw new \Exception(); } catch (\Exception $e) { } } } $foo = new Foo(); $a = 1; $foo->doFoo($a); var_dump($a);
Output for git.master, git.master_jit
object(Exception)#2 (7) { ["message":protected]=> string(0) "" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/q4dFb" ["line":protected]=> int(8) ["trace":"Exception":private]=> array(1) { [0]=> array(6) { ["file"]=> string(9) "/in/q4dFb" ["line"]=> int(18) ["function"]=> string(5) "doFoo" ["class"]=> string(3) "Foo" ["type"]=> string(2) "->" ["args"]=> array(1) { [0]=> int(1) } } } ["previous":"Exception":private]=> NULL }

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