Raco test with errortrace

[tehkonst]

In docs: 13 raco test: Run tests , a flag --errortrace is mentioned.

--errortrace — Dynamically loads errortrace before running the tests. Note that already-compiled files will not include the tracing information.

But when I launch
raco test --errortrace file.rkt
it gives me the error:
unknown switch: --errortrace
Could you tell me how to run raco test with errortrace enabled?

[samth]

That option is new in Racket 8.7. Maybe you're using an older version?

[tehkonst]

I upgraded Racket. Now the option is available. Thanks.