> ## Documentation Index
> Fetch the complete documentation index at: https://starkware-9575960b-agent-options.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# core::fmt::Debug

A trait for debug formatting, using the empty format (`{:?}`).

## Signature

```rust
pub trait Debug
```

## Examples

```rust
let word: ByteArray = "123";
println!("{:?}", word);
```

## Trait functions

### fmt

#### Signature

```rust
fn fmt(self: @T, ref f: Formatter) -> Result
```