Function rustc_infer::infer::fudge::vars_since_snapshot

fn vars_since_snapshot<'tcx, T>(
    table: &mut UnificationTable<InPlace<T, &'_ mut UnificationStorage<T>, &'_ mut InferCtxtUndoLogs<'tcx>>>, 
    snapshot_var_len: usize
) -> Range<T> where
    T: UnifyKey,
    UndoLog<'tcx>: From<UndoLog<Delegate<T>>>,