{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"hir::FnRetTy::DefaultReturn(_)"}]}
            hir::FnRetTy::DefaultReturn(_) => match closure_kind {
            hir::FnRetTy::Return(ref output) => lowerer.lower_ty(output),
                // In the case of the async block that we create for a function body,