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<?php $stream = fopen('php://stdout'); var_dump(posix_isatty($stream));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: fopen() expects at least 2 arguments, 1 given in /in/Y2RHb:2 Stack trace: #0 /in/Y2RHb(2): fopen('php://stdout') #1 {main} thrown in /in/Y2RHb on line 2
Process exited with code 255.

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