Function rustc::traits::normalize_param_env_or_error

pub fn normalize_param_env_or_error<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, unnormalized_env: ParameterEnvironment<'tcx>, cause: ObligationCause<'tcx>) -> ParameterEnvironment<'tcx>

Unstable (rustc_private)

Normalizes the parameter environment, reporting errors if they occur.