# E0043

Warning name: `unused_attribute`

Unused attribute.

An attribute will not take effect due to reasons such as being duplicated while
it should be unique, being applied to an entity that it has no effect, or being
misused

## Erroneous example

```{literalinclude} /sources/error_codes/0043_error/top.mbt
:language: moonbit
```

## Suggestion

Apply the fix according to the specific warning message.

```{literalinclude} /sources/error_codes/0043_fixed/top.mbt
:language: moonbit
```