{"ast_node_type":"other","tokens":[{"end":101,"kind":"keyword","start":0,"text":"///"}]}
///  1. All `unwind` fields in them must be `UnwindAction::Terminate` or `UnwindAction::Unreachable`.
/// `cleanup` basic blocks have a couple restrictions:
///  2. `Return` terminators are not allowed in them. `Terminate` and `Resume` terminators are.