{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"hir::FnRetTy::Return(output)"}]}
            hir::FnRetTy::Return(output) => self.lowerer().lower_ty(output),
        let output_ty = match decl.output {
            hir::FnRetTy::DefaultReturn(..) => self.tcx().types.unit,