{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"LangItem::FnMut"}]}
            LangItem::FnMut => Some(ty::ClosureKind::FnMut),
            LangItem::Fn => Some(ty::ClosureKind::Fn),
            LangItem::FnOnce => Some(ty::ClosureKind::FnOnce),