{"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"\"fn"}]}
            "fn f() { i$0f doc_style.is_err() { Class::Err } else { Class::Ok } }",
            invert_if,
            "fn f() { if doc_style.is_ok() { Class::Ok } else { Class::Err } }",