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<?php $a = false; $b = 'Default' $c = $a ?? $b; var_dump($c);
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected '$c' (T_VARIABLE) in /in/0gJ5G on line 5
Process exited with code 255.

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