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<?php namespace Foo; call_user_func(function (array &$ref) {}, 'not_an_array_variable');
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Foo\{closure}(): Argument #1 ($ref) must be passed by reference, value given in /in/vNN9X on line 3 Fatal error: Uncaught TypeError: Foo\{closure}(): Argument #1 ($ref) must be of type array, string given in /in/vNN9X:3 Stack trace: #0 [internal function]: Foo\{closure}('not_an_array_va...') #1 /in/vNN9X(3): call_user_func(Object(Closure), 'not_an_array_va...') #2 {main} thrown in /in/vNN9X on line 3
Process exited with code 255.

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