rustc_trait_selection::solve::fulfill::derive_errors

Function derive_host_cause

Source 
fn derive_host_cause<'tcx>(
    tcx: TyCtxt<'tcx>,
    candidate_kind: ProbeKind<TyCtxt<'tcx>>,
    cause: ObligationCause<'tcx>,
    idx: usize,
    parent_host_pred: Binder<'tcx, HostEffectPredicate<'tcx>>,
) -> ObligationCause<'tcx>