Function rustc::traits::normalize_param_env_or_error

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

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Normalizes the parameter environment, reporting errors if they occur.