# `Tempo.UnboundedSetError`
[🔗](https://github.com/elixir-tempo/tempo/blob/v1.6.4/lib/tempo/exception/unbounded_set_error.ex#L1)

Exception raised when an aggregate operation needs every member of
an interval set whose backend is unbounded (a lazy generator such as
`Tempo.weekends/1`).

Unbounded sets support the walking operations — `Enum.take/2`,
`Tempo.IntervalSet.walk/1`, `covered?/2`, `first/1`, and use as a
`skipping:` busy set — but any operation whose answer requires the
whole member list (`to_list/1`, `count/1`, `coalesce/1`, set
algebra) refuses rather than walking forever. Bound the set first:
intersect the walk with a finite span, or take the members you need.

# `t`

```elixir
@type t() :: %Tempo.UnboundedSetError{
  __exception__: term(),
  operation: atom() | String.t() | nil,
  set: Tempo.IntervalSet.t() | nil
}
```

---

*Consult [api-reference.md](api-reference.md) for complete listing*