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<?php trait PropertiesTrait { public ?array $x = []; } class AbstractPropertiesExample { public function __construct( public ?array $x = [] ) {} } class PropertiesExample extends AbstractPropertiesExample { use PropertiesTrait; } $example = new PropertiesExample; $example->x;
Output for 8.5.0 - 8.5.11
Output for 8.1.26 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26
Fatal error: AbstractPropertiesExample and PropertiesTrait define the same property ($x) in the composition of PropertiesExample. However, the definition differs and is considered incompatible. Class was composed in /in/eQOGs on line 15
Process exited with code 255.

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