# E0231

Call of a value that is not a function.

**Machine-applicable fix:** none.

## Example

This program fails with `E0231`.

```oska
fn main() {
    let x = 1
    x()
}
```

## Fixed

The same program, fixed.

```oska
fn main() {
    let f = || 1
    let y = f()
}
```

Listed in the [checker notes](/checker.md#e0231). `oskac explain E0231` prints this entry offline.