{"ast_node_type":"function","tokens":[{"end":64,"kind":"keyword","start":0,"text":"\"fn"}]}
        "fn add() {} fn add_one() {} fn f() -> i32 {3 + 2 + 1}",
        &["$a + 1 ==>> add_one($a)", "$a + $b ==>> add($a, $b)"],
        expect![["fn add() {} fn add_one() {} fn f() -> i32 {add_one(add(3, 2))}"]],