Return type Symfony\Component\OptionsResolver\OptionsResolver of method Headsnet\GrumPHP\GitlabLint\GitlabLintTask::getConfigurableOptions() is not covariant with return type GrumPHP\Task\Config\ConfigOptionsResolver of method GrumPHP\Task\TaskInterface::getConfigurableOptions().

Non-abstract class Headsnet\GrumPHP\GitlabLint\Loader contains abstract method imports() from interface GrumPHP\Extension\ExtensionInterface.

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