{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
            let prev = delegate.register_hidden_type_in_storage(key, ty, I::Span::dummy());
        for &(key, ty) in &input.predefined_opaques_in_body.opaque_types {
            // It may be possible that two entries in the opaque type storage end up