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<?php interface FormStateInterface {} class FormState implements FormStateInterface {} class ConfigFormBase { public function submitForm(array &$form, FormStateInterface $form_state) { print "original"; } } trait ValidatableConfigFormTrait { public function submitForm(array &$form, FormStateInterface $form_state) { print "trait"; } } class MyForm extends ConfigFormBase { use ValidatableConfigFormTrait; } $form = []; (new MyForm())->submitForm($form, new FormState());
Output for git.master_jit, git.master, rfc.property-hooks
trait

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