Mike Beckerle created DAFFODIL-2306:

             Summary: Abort: NadaParsers are all supposed to optimize out!
                 Key: DAFFODIL-2306
                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2306
             Project: Daffodil
          Issue Type: Bug
          Components: Middle "End"
    Affects Versions: 2.5.0
            Reporter: Mike Beckerle
             Fix For: 2.6.0

I have a schema that uses this group. It's a way of doing an optional element
using a choice-by-dispatch.

Running this causes an abort when a NadaParser survives the optimizer and makes 
it into the parser definition.
<xs:group name="wordPadding">
  <xs:choice dfdl:choiceDispatchKey="{ if ($tns:l16WordPaddingBits eq 0) then 
'0' else '1' }" >
     <xs:sequence dfdl:choiceBranchKey="0"/>
      <xs:element dfdl:choiceBranchKey="1" name="spare" type="vmfgi:padding" 
dfdl:length="{ $tns:l16WordPaddingBits }" />

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