`.col` [should be `.column`](https://github.com/broccolijs/broccoli/blob/40ab9f303e138309f8fa764739de72d4a34ec096/lib/middleware.js#L99), but I added `.column` mostly with the intent to show source code on the error page in the browser some day, like so

```
if (cond {
         ^

Unexpected {
```

So in the terminal, as long as we're not doing this, perhaps we should only print the line number? Like `file.js:52`.