stevedlawrence opened a new pull request, #1228:
URL: https://github.com/apache/daffodil/pull/1228

   Currently, restriction validation logic takes place in a finally block of 
the ElementParserBase combinator when the parse status is "success". However, 
if an exception is thrown (e.g. Runtime SDE) then we stil hit this finally 
block, parse status could still be "success", but we likely won't have any data 
to validate. This can lead to a confusing exception that hides the original 
exception.
   
   To fix this, this moves validation to the end of the try block, so that we 
only ever attempt validation if all aspects of a parse succeed. And if an 
exception is thrown, then this code is simply skipped.
   
   This also modifies the TDML runner so it correctly sets validationMode even 
when errors are expected. This allows us to test this case where we expect a 
Runtime SDE error when validation is enabled.
   
   DAFFODIL-2895


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