generated-sources omission -- weirdness in a project containing groovy compiler

screenshot of intellij seeing red; the source files are in target/classes/generated, for whatever reason, but no target/generated-sources exists.


pom is at https://github.com/jnorthrup/xcaml/blob/master/pdp-core/pom.xml suspecting

``` xml



maven-compiler-plugin
3.2

groovy-eclipse-compiler



org.codehaus.groovy
groovy-eclipse-compiler
2.9.1-01


org.codehaus.groovy
groovy-eclipse-batch
2.3.7-01




org.apache.maven.plugins
maven-eclipse-plugin
2.9


org.eclipse.jdt.groovy.core.groovyNature


org.eclipse.jdt.launching.JRE_CONTAINER
GROOVY_DSL_SUPPORT



```