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<?php function foo($foo) { $foo->bar++; } var_dump(foo($foo));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $foo in /in/dL4LB on line 5 Fatal error: Uncaught Error: Attempt to increment/decrement property "bar" on null in /in/dL4LB:3 Stack trace: #0 /in/dL4LB(5): foo(NULL) #1 {main} thrown in /in/dL4LB on line 3
Process exited with code 255.

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