pub(crate) fn handle_call_hierarchy_prepare(
snap: GlobalStateSnapshot,
params: CallHierarchyPrepareParams,
) -> Result<Option<Vec<CallHierarchyItem>>>pub(crate) fn handle_call_hierarchy_prepare(
snap: GlobalStateSnapshot,
params: CallHierarchyPrepareParams,
) -> Result<Option<Vec<CallHierarchyItem>>>