# XO0901: `dbg(...)` left in code

Reported by `xo vet` as a warning. `dbg(expr)` prints the expression source and its `Debug` value and returns the value, which is useful while debugging but noise in committed code; `xo build --ci` rejects it. Remove the call and keep the expression, or log through `std/log` if the output is meant to stay. See core 11.4.

## Example

```xo
fn area(w: Int, h: Int) -> Int {
  dbg(w * h)
}
```

## Fix

```xo
fn area(w: Int, h: Int) -> Int {
  w * h
}
```

Run `xo explain XO0901` for this text in a terminal, or see
[section 10.6 of the specification](../../spec/core/#106-diagnostic-codes).