6 files declare their use of ExecutableManagerInterface

BlockForm.php in core/modules/block/src/BlockForm.php
BlockFormTest.php in core/modules/block/tests/src/Unit/BlockFormTest.php
ConditionInterface.php in core/lib/Drupal/Core/Condition/ConditionInterface.php
ConditionManager.php in core/lib/Drupal/Core/Condition/ConditionManager.php
ConditionPluginBase.php in core/lib/Drupal/Core/Condition/ConditionPluginBase.php
ViewsBlockTest.php in core/modules/views/tests/src/Unit/Plugin/Block/ViewsBlockTest.php

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