stevedlawrence commented on a change in pull request #731:
URL: https://github.com/apache/daffodil/pull/731#discussion_r789701899



##########
File path: 
daffodil-test/src/test/resources/org/apache/daffodil/section07/variables/setVarWIthValueLength.tdml
##########
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<testSuite
+  xmlns="http://www.ibm.com/xmlns/dfdl/testData";
+  xmlns:dfdl="http://www.ogf.org/dfdl/dfdl-1.0/";
+  xmlns:daf="urn:ogf:dfdl:2013:imp:daffodil.apache.org:2018:ext"
+  xmlns:tdml="http://www.ibm.com/xmlns/dfdl/testData";
+  xmlns:f="http://example.com";
+  xmlns:xs="http://www.w3.org/2001/XMLSchema";
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+  defaultRoundTrip="onePass"
+  defaultValidation="on">
+
+  <tdml:defineSchema name="s1" elementFormDefault="unqualified" 
useDefaultNamespace="false"
+                     xmlns="http://www.w3.org/2001/XMLSchema";>
+
+
+    <include 
schemaLocation="org/apache/daffodil/xsd/DFDLGeneralFormat.dfdl.xsd"/>
+
+    <dfdl:format ref="f:GeneralFormat"
+                 representation="binary"/>
+
+    <dfdl:defineVariable name="someVar" type="xs:int"/>
+
+
+    <element name="root">
+      <complexType>
+        <sequence>
+          <element name="someElement" type="xs:int"/>
+          <!--
+          DAFFODIL-2629 This setVariable calling dfdl:valueLength on the prior 
element. Causes Runtime SDE."
+          -->
+          <sequence>
+            <annotation>
+              <appinfo source="http://www.ogf.org/dfdl/";>
+                <dfdl:setVariable ref="f:someVar">{ 
dfdl:valueLength(someElement, "bytes") }

Review comment:
       If you use the `value` attribute for the expression does it still fail? 
Might be good to add a test for both syntaxes to make sure however this is 
resolved works for both.

##########
File path: 
daffodil-test/src/test/resources/org/apache/daffodil/section07/variables/setVarWIthValueLength.tdml
##########
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<testSuite
+  xmlns="http://www.ibm.com/xmlns/dfdl/testData";
+  xmlns:dfdl="http://www.ogf.org/dfdl/dfdl-1.0/";
+  xmlns:daf="urn:ogf:dfdl:2013:imp:daffodil.apache.org:2018:ext"
+  xmlns:tdml="http://www.ibm.com/xmlns/dfdl/testData";
+  xmlns:f="http://example.com";
+  xmlns:xs="http://www.w3.org/2001/XMLSchema";
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+  defaultRoundTrip="onePass"
+  defaultValidation="on">
+
+  <tdml:defineSchema name="s1" elementFormDefault="unqualified" 
useDefaultNamespace="false"
+                     xmlns="http://www.w3.org/2001/XMLSchema";>
+
+
+    <include 
schemaLocation="org/apache/daffodil/xsd/DFDLGeneralFormat.dfdl.xsd"/>
+
+    <dfdl:format ref="f:GeneralFormat"
+                 representation="binary"/>
+
+    <dfdl:defineVariable name="someVar" type="xs:int"/>
+
+
+    <element name="root">
+      <complexType>
+        <sequence>
+          <element name="someElement" type="xs:int"/>
+          <!--
+          DAFFODIL-2629 This setVariable calling dfdl:valueLength on the prior 
element. Causes Runtime SDE."
+          -->
+          <sequence>
+            <annotation>
+              <appinfo source="http://www.ogf.org/dfdl/";>
+                <dfdl:setVariable ref="f:someVar">{ 
dfdl:valueLength(someElement, "bytes") }
+                </dfdl:setVariable>
+              </appinfo>
+            </annotation>
+          </sequence>

Review comment:
       Is it worth added an inputValueCalc and/or outputValueCalc to ensure 
that the variable actually gets the right value? I could imagine a but where 
the SDE goes away but doesn't actually calculate the correct value and we 
wouldn't know.




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