{"ast_node_type":"function","tokens":[{"end":61,"kind":"keyword","start":0,"text":"do_check(r#\"fn"}]}
        do_check(r#"fn foo($0x: i32) {}"#, &["x", "x: i32"]);
    fn test_extend_selection_list() {
        do_check(r#"fn foo($0x: i32, y: i32) {}"#, &["x", "x: i32", "x: i32, "]);