7 functions implement hook_comment_delete()

Note: the procedural functions in this list are found by pattern matching, so the list may include some functions that are not actually implementations of this hook.

EntityCrudHookTestHooks::commentDelete in core/modules/system/tests/modules/entity_crud_hook_test/src/Hook/EntityCrudHookTestHooks.php
Implements hook_ENTITY_TYPE_delete() for comment entities.
entity_crud_hook_test_comment_delete in modules/simpletest/tests/entity_crud_hook_test.module
Implements hook_comment_delete().
forum_comment_delete in modules/forum/forum.module
Implements hook_comment_delete().
NodeHooks1::commentDelete in core/modules/node/src/Hook/NodeHooks1.php
Implements hook_ENTITY_TYPE_delete() for comment entities.
search_comment_delete in modules/search/search.module
Implements hook_comment_delete().
tracker_comment_delete in modules/tracker/tracker.module
Implements hook_comment_delete().
trigger_comment_delete in modules/trigger/trigger.module
Implements hook_comment_delete().

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