# `Taxo.CyclicDerivationError`
[🔗](https://github.com/rulvio/taxo/blob/v0.2.0/lib/taxo/cyclic_derivation_error.ex#L1)

`Taxo.derive/3` raises this error when a new parent/child relationship
would create a cycle in the taxonomy.

# `t`

```elixir
@type t() :: %Taxo.CyclicDerivationError{
  __exception__: term(),
  child: Taxo.tag(),
  message: String.t(),
  parent: Taxo.tag()
}
```

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