Function rustc_trait_selection::traits::vtable_trait_first_method_offset

fn vtable_trait_first_method_offset<'tcx>(
    tcx: TyCtxt<'tcx>, 
    key: (PolyTraitRef<'tcx>, PolyTraitRef<'tcx>)
) -> usize

Find slot base for trait methods within vtable entries of another trait