stevedlawrence commented on a change in pull request #686:
URL: https://github.com/apache/daffodil/pull/686#discussion_r758346440



##########
File path: 
daffodil-runtime1/src/main/scala/org/apache/daffodil/processors/parsers/ExpressionEvaluatingParsers.scala
##########
@@ -161,15 +162,18 @@ class SetVariableParser(expr: CompiledExpression[AnyRef], 
decl: VariableRuntimeD
   }
 }
 
-class NewVariableInstanceStartParser(override val context: VariableRuntimeData)
+final class NewVariableInstanceStartParser(vrd: VariableRuntimeData, trd: 
TermRuntimeData)
   extends PrimParser {
+
+  override def context = trd

Review comment:
       Any chance this could affect diagnostics? For example, if `evaluate` is 
called and it results in a runtime SDE, what gets used as the context for that 
SDE? If it uses this `context` variable then the SDE message might only include 
the term the NVI is placed on instead of the actual NVI element, which is maybe 
confusing? Reading the code, it's not exactly clear to me what a diagnostic 
would look like. Might be worth adding a test (or maybe we already have a test) 
to make sure the diagnostic is reasonable?




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