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<?php $a = null; print $a ?? 'b'; print "\n"; print $a ?: 'b'; print "\n"; print $c ?? 'a'; print "\n"; print $c ?: 'a'; print "\n";
Output for git.master_jit, git.master, rfc.property-hooks
b b a Warning: Undefined variable $c in /in/nZDFs on line 14 a

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