Dump the generated AST tree:
in a groovy Console (in intellij Ctrl-Shift-A: groovyConsole)
import groovy.inspect.swingui.AstNodeToScriptAdapter
import org.codehaus.groovy.control.CompilePhase
def script = """
import com.blackbuild.groovy.configdsl.transform.*
// code
"""
new AstNodeToScriptAdapter().compileToScript(script, CompilePhase.CLASS_GENERATION.phaseNumber)