Function check_number_of_early_bound_regions 

pub(super) fn check_number_of_early_bound_regions<'tcx>(
    tcx: TyCtxt<'tcx>,
    impl_def_id: LocalDefId,
    trait_def_id: DefId,
    impl_generics: &Generics,
    impl_params: usize,
    trait_generics: &Generics,
    trait_params: usize,
) -> Result<(), CheckNumberOfEarlyBoundRegionsError>