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<?php function sum($a):float { return null; } sum(0);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: sum(): Return value must be of type float, null returned in /in/F4TBE:4 Stack trace: #0 /in/F4TBE(7): sum(0) #1 {main} thrown in /in/F4TBE on line 4
Process exited with code 255.

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