Function rustc_trait_selection::traits::object_safety::contains_illegal_impl_trait_in_trait

pub fn contains_illegal_impl_trait_in_trait<'tcx>(
    tcx: TyCtxt<'tcx>,
    fn_def_id: DefId,
    ty: Binder<'tcx, Ty<'tcx>>
) -> Option<MethodViolationCode>