[plt-scheme] planet: version collision on schemeunit.plt

From: Robby Findler (robby at cs.uchicago.edu)
Date: Sun Apr 15 17:00:15 EDT 2007

DrScheme isn't using schemeunit.

(Some tool might be, however.)


On 4/15/07, Richard Cobbe <cobbe at ccs.neu.edu> wrote:
> I'm going back to update some old code of mine that was originally written
> to use SchemeUnit v1.1.  (As part of the update, I intend to migrate it to
> the latest release of SchemeUnit as well as a bunch of other PLaneT
> packages.
> When I load the module that runs the SchemeUnit GUI on my tests in DrScheme
> (SVN earlier today), I get the error
>     Package schemeunit.plt loaded twice with multiple incompatible versions:
>     attempted to load version 1.1 while version 2.6 was already loaded
> I have another module that runs the SchemeUnit text UI on my tests, but
> it's otherwise identical.  When I load this text module in DrScheme, I get
> the same error, but if I load it in MzScheme, everything's fine -- it runs
> my tests as I expect.
> My first question was, of course, "OK, so who's using SchemeUnit 2.6?"
> Unfortunately, planet isn't very helpful there:
>     [Ridcully:~/work/cobbe/dev/classic-java]$ planet -l
>       /Users/cobbe/work/cobbe/dev/classic-java/requires:
>         require.plt (ryanc) 1 0
>       /Users/cobbe/work/cobbe/dev/classic-java/run-graphical-tests:
>         schemeunit.plt      (schematics)    1 1
> and that's it.  (I did a "planet -U" before trying it the last time to
> clear out any stale entries in the link table -- but I'd still expect to
> see someone trying to use 2.6.)
> So:
>   1) What's going on?  I know what the immediate cause of the error is,
>      but I'd like to know who I'm colliding with -- especially since all of
>      my code uses 1.1, and since I haven't loaded anything else.
>   2) Is there any way to include the conflict information in the error
>      message?  I'd like to know which module/package I'm conflicting with.
> I'm far from an expert in these things, but it looks to me like DrScheme
> itself is using SchemeUnit.  If so, it's awfully unfortunate that a change
> in DrScheme's test suites would break other people's code like this.
> Richard
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