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Output for 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6
Typed property Foobar::$foo must not be accessed before initialization Error
Output for 8.1.32
Parse error: syntax error, unexpected token "readonly", expecting end of file in /in/Wn7En on line 3
Process exited with code 255.

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