I have a scribble document with several examples. When I view the scribble
html output by using DrRacket, all the examples are fine, the output is
correct, and I see no errors.

Then I go to the directory, use raco pkg install, and I get a major text
dump which starts with "cannot instantiate 'racket/gui/base' a second time
in the same process." But I didn't even try to instantiate it the first
time. There's no use of gui at all in any part of the collection. I only
create one evaluator for scribble examples:
@(define this-eval
   (let ([eval (make-base-eval)])
     (eval '(begin
              (require racket/math "main.rkt")))
     eval))

What could I be doing wrong?

Deren

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