{"ast_node_type":"function","tokens":[{"end":81,"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($0x: i32,y: i32) {}"#, &["x", "x: i32", "x: i32,", "(x: i32,y: i32)"]);
        do_check(r#"fn foo(x: i32, $0y: i32, ) {}"#, &["y", "y: i32", "y: i32, "]);