In the latest release, DrScheme freezes indefinitely when trying to
load the Dracula language level. It worked in 4.2.4.x, it worked in
the 4.2.4.900 release candidate I tried, and it works in 4.2.5.8 on
the trunk, but not in the release. I have narrowed the problem down
to the module path in the Dracula module-based-language-level's
"get-module" method. If I change the module to be "scheme" instead,
the language level loads fine (aside from using the wrong module); the
GUI elements work fine, and so forth.
The module path causing the problem is (planet "dracula.ss" ("cce"
"dracula.plt" 8 10) "lang"). In both 4.2.5 and 4.2.5.8, I can require
this path into a regular "#lang scheme" window just fine if "populate
compiled/ directories" is off; I get a "module mismatch" error with
that option turned on (see PR 10685).
Does anyone know what might be causing this problem, and/or how I
might work around it between now and the next release? Some students
using Dracula in Rex Page's class at the U. of Oklahoma ran into this
bug and I had to tell them to downgrade to PLT v4.2.4.
Carl Eastlund
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