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<?php $x = $foo--; var_dump($x); var_dump($foo);
Output for git.master, git.master_jit
Warning: Undefined variable $foo in /in/Bnb2D on line 3 Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/Bnb2D on line 3 NULL NULL
Output for rfc.property-hooks
Warning: Undefined variable $foo in /in/Bnb2D on line 3 NULL NULL

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