{"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"let"}]}
                    let Some(item) = self.associated_value(impl_did, item_name).or_else(|| {
                    // the impl, if local to crate (item may be defaulted), else nothing.
                        let impl_trait_ref = self.tcx.impl_trait_ref(impl_did)?;