{"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"if"}]}
            if let Some(callee_ty) = callee_ty
        let similar_assoc = |call_name: Ident| -> Option<(ty::AssocItem, ty::FnSig<'_>)> {
                && let Ok(Some(assoc)) = self.probe_op(