In some tests, we have arrays that appear inside a hidden group. When the array combinator unparser runs, we get an invariant error:

Invariant broken: event.isStart.&&(event.node.isInstanceOf[edu.illinois.ncsa.daffodil.processors.DIArray])

However, because the array is in a hidden group, we are not going to get a DIArray event, so this fails. Need to determine what the correct behavior is.

Tests that exhibit this behavior can be found in:

• edu.illinois.ncsa.daffodil.TresysTests3
• edu.illinois.ncsa.daffodil.usertests.TestBacktracking