{"ast_node_type":"variable","tokens":[{"end":98,"kind":"keyword","start":0,"text":"let"}]}
                let assoc = pprust::path_to_string(&ast::Path::from_ident(potential_assoc.ident));
            if let [trait_segment] = &poly.trait_ref.path.segments[..] {
                let ty = pprust::ty_to_string(&predicate.rhs_ty);