{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"FnTrait::FnMut"}]}
            FnTrait::FnMut => write!(f, "FnMut"),
            FnTrait::FnOnce => write!(f, "FnOnce"),
            FnTrait::Fn => write!(f, "Fn"),