# XO0435: a catch-all variant built from a value a named variant has

The catch-all keeps only values no variant names. Built from a value a named variant has, it would be a second spelling of that variant, and it compares unequal to it (equality is by variant). Write the named variant, or `E.from(v)`, which picks it. See core 2.3 and decision 0493.

## Example

```xo
enum StorageClass: Str {
  Standard = "STANDARD"
  Unknown(value: Str)
}

const S: StorageClass = StorageClass.Unknown("STANDARD")
```

## Fix

```xo
enum StorageClass: Str {
  Standard = "STANDARD"
  Unknown(value: Str)
}

const S: StorageClass = StorageClass.Standard
```

Run `xo explain XO0435` for this text in a terminal, or see
[section 10.6 of the specification](../../spec/core/#106-diagnostic-codes).