{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"LangItem::FnMut"}]}
            LangItem::FnMut => Some(FnTrait::FnMut),
            LangItem::FnOnce => Some(FnTrait::FnOnce),
            LangItem::Fn => Some(FnTrait::Fn),