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<?php class foo { static $bar; } foo::$bar = function () { echo "Hello World"; }; foo::$bar();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $bar in /in/a4EKT on line 4 Fatal error: Uncaught Error: Method name must be a string in /in/a4EKT:4 Stack trace: #0 {main} thrown in /in/a4EKT on line 4
Process exited with code 255.

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