Gant seems to compile and run its tests fine using IntelliJ IDEA. Eclipse however is giving me a bit of grief. I have (finally -- long story) managed to upgrade my Eclipse installation. Compilation of Gant is fine, but the tests are showing some unexpected problems. Exemplified by the stack trace below. Now as far as I am aware powerassert is a subpackage of org.codehaus.groovy.runtime, and there is no package org.codehaus.groovy.transform.powerassert. So how can a fully cleaned and recompiled project have any references to a package that doesn't exist?