{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
            let field_ty_layout = tcx.layout_of(typing_env.as_query_input(field_ty));
            // Return the nullable type this Option-like enum can be safely represented with.
            if field_ty_layout.is_err() && !field_ty.has_non_region_param() {