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<?php function a() { yield 0 => 'a'; } function b() { yield '0' => 'b'; } function test($x) { var_dump($x); } test(...a()); echo "\n"; test(...b());
Output for git.master_jit, git.master
string(1) "a" Fatal error: Uncaught Error: Unknown named parameter $0 in /in/IQBdd:15 Stack trace: #0 {main} thrown in /in/IQBdd on line 15
Process exited with code 255.

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