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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/DecoratingExpression.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/DecoratingExpression.java
new file mode 100644
index 000000000..224bd17b9
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/DecoratingExpression.java
@@ -0,0 +1,131 @@
+package org.simantics.scl.compiler.elaboration.expressions;
+
+import java.util.ArrayList;
+
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
+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.errors.NotPatternException;
+import org.simantics.scl.compiler.elaboration.expressions.lhstype.LhsType;
+import org.simantics.scl.compiler.environment.Environment;
+import org.simantics.scl.compiler.errors.Locations;
+import org.simantics.scl.compiler.internal.codegen.references.IVal;
+import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.exceptions.MatchException;
+
+import gnu.trove.map.hash.TObjectIntHashMap;
+import gnu.trove.set.hash.THashSet;
+import gnu.trove.set.hash.TIntHashSet;
+
+public abstract class DecoratingExpression extends SimplifiableExpression {
+    public Expression expression;
+    
+    public DecoratingExpression(long loc, Expression expression) {
+        super(loc);
+        this.expression = expression;
+    }
+
+    @Override
+    public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {
+        expression.collectRefs(allRefs, refs);
+    }
+    
+    @Override
+    public void collectVars(TObjectIntHashMap<Variable> allVars,
+            TIntHashSet vars) {
+        expression.collectVars(allVars, vars);
+    }
+
+    @Override
+    protected void updateType() throws MatchException {
+        setType(expression.getType());        
+    }
+    
+    @Override
+    public void collectFreeVariables(THashSet<Variable> vars) {
+        expression.collectFreeVariables(vars);
+    }
+
+    @Override
+    public Expression simplify(SimplificationContext context) {
+        expression = expression.simplify(context);
+        return this;
+    }
+
+    @Override
+    public Expression resolve(TranslationContext context) {
+        expression = expression.resolve(context);
+        return this;
+    }
+    
+    @Override
+    public Expression resolveAsPattern(TranslationContext context) {
+        expression = expression.resolveAsPattern(context);
+        return this;
+    }
+    
+    @Override
+    public EVar getPatternHead() throws NotPatternException {
+        return expression.getPatternHead();
+    }
+    
+    @Override
+    public LhsType getLhsType() throws NotPatternException {
+        return expression.getLhsType();
+    }
+    
+    @Override
+    public void getParameters(TranslationContext translationContext,
+            ArrayList<Expression> parameters) {
+        expression.getParameters(translationContext, parameters);
+    }
+
+    @Override
+    public int getFunctionDefinitionArity() throws NotPatternException {
+        return expression.getFunctionDefinitionArity();
+    }
+
+    @Override
+    public Expression decorate(ExpressionDecorator decorator) {
+        expression = expression.decorate(decorator);
+        return this;
+    }
+
+    @Override
+    public void collectEffects(THashSet<Type> effects) {
+        expression.collectEffects(effects);
+    }
+    
+    @Override
+    public void setLocationDeep(long loc) {
+        if(location == Locations.NO_LOCATION) {
+            location = loc;
+            expression.setLocationDeep(loc);
+        }
+    }
+
+    @Override
+    public void forVariables(VariableProcedure procedure) {
+        expression.forVariables(procedure);
+    }
+
+    @Override
+    public IVal toVal(Environment env, CodeWriter w) {
+        throw new InternalCompilerError("Cannot generate code for " + getClass().getSimpleName() + ".");
+    }
+    
+    @Override
+    public Expression inferType(TypingContext context) {
+        expression = expression.inferType(context);
+        return this;
+    }
+    
+    @Override
+    public Expression checkBasicType(TypingContext context, Type requiredType) {
+        expression = expression.checkBasicType(context, requiredType);
+        return this;
+    }
+}