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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/Assignment.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/Assignment.java
new file mode 100755
index 000000000..d1d17f6ec
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/Assignment.java
@@ -0,0 +1,41 @@
+package org.simantics.scl.compiler.elaboration.expressions;
+
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
+import org.simantics.scl.compiler.types.Type;
+
+public class Assignment {
+    public Expression pattern;
+    public Expression value;
+    
+    public Assignment(Expression pattern, Expression value) {
+        if(Type.NULL_CHECKS) {
+            if(pattern == null)
+                throw new NullPointerException();
+            if(value == null)
+                throw new NullPointerException();
+        }
+        this.pattern = pattern;
+        this.value = value;
+    }
+
+    public Assignment replace(ReplaceContext context) {
+        Expression newPattern = pattern.replaceInPattern(context);
+        Expression newValue = value.replace(context);
+        return new Assignment(newPattern, newValue);
+    }
+
+    public void decorate(ExpressionDecorator decorator) {
+        pattern = pattern.decorate(decorator);
+        value = value.decorate(decorator);
+    }
+
+    public void setLocationDeep(long loc) {
+        pattern.setLocationDeep(loc);
+        value.setLocationDeep(loc);
+    }
+
+    public void forVariables(VariableProcedure procedure) {
+        value.forVariables(procedure);
+    }
+}