{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"WellKnownTrait::FnMut"}]}
        WellKnownTrait::FnMut => LangItem::FnMut,
        WellKnownTrait::Fn => LangItem::Fn,
        WellKnownTrait::FnOnce => LangItem::FnOnce,