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<?php $a = ['a' => null,'b' => null,'c' => null,]; $b = [b=>'x']; var_dump(array_merge($a, $b));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "b" in /in/XjNAE:4 Stack trace: #0 {main} thrown in /in/XjNAE on line 4
Process exited with code 255.

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