how to display line numbers of errors

I'm hacking in Racket and I keep getting errors.

The default error handler shows a s开发者_运维技巧tack trace. At the end of the stack trace, it shows the "top level" evaluation as "/path/to/file/my_module.rkt: [running body]"

How do I show the line number for the running body part?

---

If you use DrRacket, it will highlight the error location in the source. To get similar functionality in the racket REPL, see the errortrace tool.