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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/GuardedExpression.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/GuardedExpression.java
new file mode 100755
index 000000000..048c8d525
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/GuardedExpression.java
@@ -0,0 +1,43 @@
+package org.simantics.scl.compiler.elaboration.expressions;
+
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
+import org.simantics.scl.compiler.errors.Locations;
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
+import org.simantics.scl.compiler.internal.parsing.Symbol;
+
+public class GuardedExpression extends Symbol {
+    public Expression[] guards;
+    public Expression value;
+    
+    public GuardedExpression(Expression[] guards, Expression value) {
+        this.guards = guards;
+        this.value = value;
+    }
+
+    public GuardedExpression replace(ReplaceContext context) {
+        return new GuardedExpression(
+                Expression.replace(context, guards), 
+                value.replace(context));
+    }
+
+    public void decorate(ExpressionDecorator decorator) {
+        for(int i=0;i<guards.length;++i)
+            guards[i] = guards[i].decorate(decorator);
+        value = value.decorate(decorator);
+    }
+
+    public void setLocationDeep(long loc) {
+        if(location == Locations.NO_LOCATION) {
+            location = loc;
+            for(Expression guard : guards)
+                guard.setLocationDeep(loc);
+            value.setLocationDeep(loc);
+        }
+    }
+
+    public void forVariables(VariableProcedure procedure) {
+        for(Expression guard : guards)
+            guard.forVariables(procedure);
+        value.forVariables(procedure);
+    }
+}