Short backtrace

I have large codebase which uses `anyhow::{Result, Context, bail}` a lot,
and the errors don't tell much. No filename/line numbers at all.
Using `RUST_BACKTRACE=1` is not convenient.

I found https://github.com/dtolnay/anyhow/issues/22 but it will require many changes to add it everywhere.
Is there an elegant way to get short backtrace when error occur, just like we get it with `unwrap()`?

Example:

```rust
use anyhow::{Result, bail};

fn main() -> Result<()> {
job()
}

fn job() -> Result<()> {
bail!("error in job")
}
```

```console
cargo run
Error: error in job
```
Imagine large codebase with many errors coming from internal libraries... no idea where it happens.

Thanks