jadams-tresys commented on a change in pull request #450:
URL: https://github.com/apache/incubator-daffodil/pull/450#discussion_r538732508



##########
File path: 
daffodil-runtime1/src/main/scala/org/apache/daffodil/processors/VariableMap1.scala
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@@ -222,7 +300,7 @@ class VariableMap private(vTable: Map[GlobalQName, 
MStackOf[VariableInstance]])
   /**
    * For testing mostly.
    */
-  def getVariableBindings(qn: GlobalQName): MStackOf[VariableInstance] = {
+  def getVariableBindings(qn: GlobalQName): Queue[VariableInstance] = {

Review comment:
       So mutable Stack is deprecated in Scala 2.12.  It's back in 2.13, but I 
believe we are still primarily targetting 2.12




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