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<?php function foo(){ echo 'foo 1'; } if (is_callable('foo')){ runkit_function_redefine('foo','','echo "foo 2";'); } foo();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function runkit_function_redefine() in /in/8LYoj:9 Stack trace: #0 {main} thrown in /in/8LYoj on line 9
Process exited with code 255.

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