Function prepare_vtable_segments

pub fn prepare_vtable_segments<'tcx, T>(
    tcx: TyCtxt<'tcx>,
    trait_ref: PolyTraitRef<'tcx>,
    segment_visitor: impl FnMut(VtblSegment<'tcx>) -> ControlFlow<T>,
) -> Option<T>

Prepare the segments for a vtable