{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"UpmappingResult"}]}
        UpmappingResult { call_site: f(self.call_site), def_site: self.def_site.map(f) }
    pub(crate) fn map<U>(self, f: impl Fn(T) -> U) -> UpmappingResult<U> {
    }