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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/list/ListGuard.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/list/ListGuard.java
new file mode 100755
index 000000000..d591652a2
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/list/ListGuard.java
@@ -0,0 +1,91 @@
+package org.simantics.scl.compiler.elaboration.expressions.list;
+
+import gnu.trove.map.hash.TObjectIntHashMap;
+import gnu.trove.set.hash.THashSet;
+import gnu.trove.set.hash.TIntHashSet;
+
+import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
+import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
+import org.simantics.scl.compiler.elaboration.expressions.Expression;
+import org.simantics.scl.compiler.elaboration.expressions.Variable;
+import org.simantics.scl.compiler.elaboration.expressions.VariableProcedure;
+import org.simantics.scl.compiler.errors.Locations;
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+
+public class ListGuard extends ListQualifier {
+    public Expression condition;
+
+    public ListGuard(Expression condition) {
+        this.condition = condition;
+    }
+
+    @Override
+    public void checkType(TypingContext context) {
+        condition.checkType(context, Types.BOOLEAN);
+    }
+
+    @Override
+    public void collectRefs(TObjectIntHashMap<Object> allRefs,
+            TIntHashSet refs) {
+        condition.collectRefs(allRefs, refs);
+    }
+
+    @Override
+    public void collectVars(TObjectIntHashMap<Variable> allVars,
+            TIntHashSet vars) {
+        condition.collectVars(allVars, vars);
+    }
+
+    @Override
+    public void collectFreeVariables(THashSet<Variable> vars) {
+        condition.collectFreeVariables(vars);
+    }
+
+    @Override
+    public CompiledQualifier compile(SimplificationContext context) {
+        return new CompiledQualifier(
+                context.guardList(condition.copy()), 
+                context.tuple());
+    }
+
+    @Override
+    public void resolve(TranslationContext context) {
+        condition = condition.resolve(context);        
+    }
+
+    @Override
+    public void decorate(ExpressionDecorator decorator) {
+        condition = condition.decorate(decorator);
+    }
+    
+    @Override
+    public void collectEffects(THashSet<Type> effects) {
+        condition.collectEffects(effects);
+    }
+    
+    @Override
+    public void setLocationDeep(long loc) {
+        if(location == Locations.NO_LOCATION) {
+            location = loc;
+            condition.setLocationDeep(loc);
+        }
+    }
+    
+    @Override
+    public void accept(ListQualifierVisitor visitor) {
+        visitor.visit(this);
+    }
+    
+    @Override
+    public void forVariables(VariableProcedure procedure) {
+        condition.forVariables(procedure);
+    }
+    
+    @Override
+    public ListQualifier accept(ListQualifierTransformer transformer) {
+        return transformer.transform(this);
+    }
+}