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<?php function foo($flag = false): \Generator { if ($flag) { return null; } yield from [1, 2]; } function bar($flag = false): \Generator { if ($flag) { return null; } return internal(); } function internal(): \Generator { yield from [1, 2]; } foreach (foo() as $v){} foreach (foo(true) as $v){} foreach (bar() as $v){} foreach (bar(true) as $v){}
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: bar(): Return value must be of type Generator, null returned in /in/EpIjA:15 Stack trace: #0 /in/EpIjA(29): bar(true) #1 {main} thrown in /in/EpIjA on line 15
Process exited with code 255.

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