{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"hir::TraitFn::Provided(body)"}]}
                hir::TraitFn::Provided(body) => (sig, generics, Some(body), None),
                hir::TraitFn::Required(params) => (sig, generics, None, Some(params)),
            },