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<?php define('IN_DIR', 'Hi'); var_dump(IN_DIR); runkit_constant_redefine('IN_DIR', 'Hello'); var_dump(IN_DIR);
Output for git.master, git.master_jit, rfc.property-hooks
string(2) "Hi" Fatal error: Uncaught Error: Call to undefined function runkit_constant_redefine() in /in/0eZHo:5 Stack trace: #0 {main} thrown in /in/0eZHo on line 5
Process exited with code 255.

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