[racket] make-evaluator and (old style) planet packages

How can I use make-evaluator with a planet package as a language?

If I were to do (make-evaluator '(planet dyoo/bf:1:8/language))

I get the error "#%require: not at top-level or in module body in:
(#%require (planet dyoo/bf:1:8/language))"

Thoughts?

--Spencer Florence
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