Description:
System seems to be using the terminator as both terminator and initiator. Doc_07 in nillable.tdml uses an [ for an initiator and a ] as a terminator amongst other nill parameters. However when running test test_nillable1 in TestNillableDebug.scala with logging set to debug the system will report that it can't find init(]) If you change the terminator to something else like T and rerun the test the system will say can not find init(T). Taylor instructed me on how to set logging levels so we could verify that this is an actual issue and not an issue with the printout from daffodill.Debuger

Steps to reproduce:
1) Turn on debug level logging
2) Run test test_nillable1
3) Verify that system uses the terminator as the initiator
4) Change the terminator and re run
5) Verify that the system is using the new terminator as the initiator

Problem:
It may be something as simple as a copy and paste issue or a variable simply being given the wrong value but it seems fairly clear that the system is using the value of the terminator as the value to use for the initiator as well.