{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"hir::FnRetTy::Return(ref"}]}
            hir::FnRetTy::Return(ref output) => lowerer.lower_ty(output),
        let supplied_return = match decl.output {
            hir::FnRetTy::DefaultReturn(_) => match closure_kind {