{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"ctx.type_param_mode(ParamLoweringMode::Placeholder);"}]}
                ctx.type_param_mode(ParamLoweringMode::Placeholder);
            |ctx| {
                data.params.iter().map(|&type_ref| ctx.lower_ty(type_ref)).collect::<Vec<_>>()