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<?php $a = 'foo'; $b = 'bar'; $c = 'qux'; $d = "{$foo}{$bar}{$qux}";
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $foo in /in/PlSub on line 6 Warning: Undefined variable $bar in /in/PlSub on line 6 Warning: Undefined variable $qux in /in/PlSub on line 6

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