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<?php echo "is_null ( ", var_export("", true), " ) = ", var_export(is_null(null), true), " \n";
Output for git.master, git.master_jit, rfc.property-hooks
is_null ( '' ) = Fatal error: Uncaught Error: Call to undefined function  var_export() in /in/8MoeR:3 Stack trace: #0 {main} thrown in /in/8MoeR on line 3
Process exited with code 255.

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