[error] Test edu.illinois.ncsa.daffodil.section23.dfdl_expressions.TestDFDLExpressions.test_testBit_3 failed: edu.illinois.ncsa.daffodil.exceptions.Abort: Invariant broken. not setup
[error] edu.illinois.ncsa.daffodil.exceptions.Assert$.abort(Assert.scala:95)
[error] edu.illinois.ncsa.daffodil.exceptions.Assert$.invariantFailed(Assert.scala:136)
[error] edu.illinois.ncsa.daffodil.dpath.Expression.parent$lzycompute(Expression.scala:99)
[error] edu.illinois.ncsa.daffodil.dpath.Expression.parent(Expression.scala:97)
[error] at edu.illinois.ncsa.daffodil.exceptions.Assert$.abort(Assert.scala:95)

See test test_testBit_3 in the following files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_functions/Functions.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressionsDebug.scala
daffodil-test/src/test/scala/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressions.scala