# E0067

Warning name: `unused_async`

Useless `async` annotation.

This warning is emitted when an `async` annotation is redundant. Remove the
redundant `async` keyword to keep code concise.

## Erroneous example

```{literalinclude} /sources/error_codes/0067_error/top.mbt
:language: moonbit
```

## Suggestion

Remove the redundant `async` annotation:

```{literalinclude} /sources/error_codes/0067_fixed/top.mbt
:language: moonbit
```