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<?php $a = [ 'b' => [ 'c' = 'foo', ], ]; var_dump($a);
Output for 8.2.27 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.15, 8.5.0
Parse error: syntax error, unexpected token "=", expecting "]" in /in/1obkZ on line 5
Process exited with code 255.

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