{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"WellKnownTrait::Fn"}]}
        WellKnownTrait::Fn => LangItem::Fn,
        WellKnownTrait::Drop => LangItem::Drop,
        WellKnownTrait::FnMut => LangItem::FnMut,