{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
    let bounds = bounds.map_or_else(String::new, |it| format!(": {it}"));
pub fn type_param(name: ast::Name, bounds: Option<ast::TypeBoundList>) -> ast::TypeParam {
    ast_from_text(&format!("fn f<{name}{bounds}>() {{ }}"))