A couple of weeks ago, you showed me the trick that rackunit uses to allow 
single-instantiation of a modules.  I'm now trying to do this
for a planet package, and it looks like I have to change the required module 
from being a relative to being an absolute path.  That is:

(require (prefix-in drlink: private/drracket-link))

must become

(require (prefix-in drlink: (planet "drracket-link.rkt" ("clements" 
"rsound.plt") "private")))

This works, but seems extremely fragile.  Does it make sense to you that this 
would be required?  Without it, I get the error below:

namespace-attach-module: unknown module (in the source namespace): 

 === context ===
initialize-console method in ...cket/private/rep.rkt:508:4
/Users/clements/plt/collects/drracket/private/main.rkt:663:0: make-basic
/Users/clements/plt/collects/drracket/tool-lib.rkt: [running body]
/Users/clements/plt/collects/drracket/private/drracket-normal.rkt: [running 
/Users/clements/plt/collects/drracket/drracket.rkt: [running body]



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