{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"self.eq(goal.param_env,"}]}
        self.eq(goal.param_env, a_elem_ty, b_elem_ty)?;
    ) -> Result<Candidate<I>, NoSolution> {
        self.probe_builtin_trait_candidate(BuiltinImplSource::Misc)