{"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"do_check(r#\"fn"}]}
        do_check(r#"fn foo(x: i32, $0y: i32, ) {}"#, &["y", "y: i32", "y: i32, "]);
        do_check(r#"fn foo(x: i32, $0y: i32) {}"#, &["y", "y: i32", ", y: i32"]);
        do_check(r#"fn foo(x: i32,$0y: i32) {}"#, &["y", "y: i32", ",y: i32"]);