ST6RI-979 Remove model mutation in adapters for expression result parameter creation

org.omg.kerml.xtext/src/org/omg/kerml/xtext/postprocessing/FeatureReferenceExpressionParserPostProcessor.java

@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * SysML 2 Pilot Implementation
+ * Copyright (c) 2026 Model Driven Solutions, Inc.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+
+package org.omg.kerml.xtext.postprocessing;
+
+import org.omg.sysml.lang.sysml.FeatureReferenceExpression;
+import org.omg.sysml.util.TypeUtil;
+
+public class FeatureReferenceExpressionParserPostProcessor extends ExpressionParserPostProcessor {
+
+	public FeatureReferenceExpressionParserPostProcessor(FeatureReferenceExpression element) {
+		super(element);
+	}
+
+	@Override
+	public FeatureReferenceExpression getTarget() {
+		return (FeatureReferenceExpression)super.getTarget();
+	}
+
+	@Override
+	public void postProcess() {
+		super.postProcess();
+		TypeUtil.addResultParameterTo(getTarget());
+	}
+
+}

org.omg.kerml.xtext/src/org/omg/kerml/xtext/postprocessing/InstantiationExpressionParserPostProcessor.java

@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * SysML 2 Pilot Implementation
+ * Copyright (c) 2026 Model Driven Solutions, Inc.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+
+package org.omg.kerml.xtext.postprocessing;
+
+import org.omg.sysml.lang.sysml.InstantiationExpression;
+import org.omg.sysml.util.TypeUtil;
+
+public class InstantiationExpressionParserPostProcessor extends ExpressionParserPostProcessor {
+
+	public InstantiationExpressionParserPostProcessor(InstantiationExpression element) {
+		super(element);
+	}
+
+	@Override
+	public InstantiationExpression getTarget() {
+		return (InstantiationExpression)super.getTarget();
+	}
+
+	@Override
+	public void postProcess() {
+		super.postProcess();
+		TypeUtil.addResultParameterTo(getTarget());
+	}
+
+}

org.omg.kerml.xtext/src/org/omg/kerml/xtext/postprocessing/KerMLParserPostProcessorFactory.java

@@ -98,11 +98,21 @@ public ElementParserPostProcessor caseFeatureInverting(FeatureInverting element)
 			return new FeatureInvertingParserPostProcessor(element);
 		}
 
+		@Override
+		public ElementParserPostProcessor caseFeatureReferenceExpression(FeatureReferenceExpression element) {
+			return new FeatureReferenceExpressionParserPostProcessor(element);
+		}
+
 		@Override
 		public ElementParserPostProcessor caseFeatureTyping(FeatureTyping element) {
 			return new FeatureTypingParserPostProcessor(element);
 		}
 
+		@Override
+		public ElementParserPostProcessor caseInstantiationExpression(InstantiationExpression element) {
+			return new InstantiationExpressionParserPostProcessor(element);
+		}
+
 		@Override
 		public ElementParserPostProcessor caseImport(Import element) {
 			return new ImportParserPostProcessor(element);

org.omg.sysml.execution/src/org/omg/sysml/execution/expressions/ExpressionEvaluator.java

@@ -72,6 +72,7 @@ public EList<Element> evaluateInvocation(InvocationExpression expression, Elemen
 
 	protected InvocationExpression instantiateInvocation(InvocationExpression expression, Element target) {
 		InvocationExpression instantiation = SysMLFactory.eINSTANCE.createInvocationExpression();
+		TypeUtil.addResultParameterTo(instantiation);
 
 		// Copy instantiatedType from original expression.
 		Type instantiatedType = expression.getInstantiatedType();