Function rustc_trait_selection::traits::vtable::vtable_trait_upcasting_coercion_new_vptr_slot

pub(crate) fn vtable_trait_upcasting_coercion_new_vptr_slot<'tcx>(
    tcx: TyCtxt<'tcx>,
    key: (Ty<'tcx>, Ty<'tcx>)
) -> Option<usize>

Find slot offset for trait vptr within vtable entries of another trait