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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/ASTExpression.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/ASTExpression.java
new file mode 100755
index 000000000..aeeb1ec1e
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/ASTExpression.java
@@ -0,0 +1,78 @@
+package org.simantics.scl.compiler.elaboration.expressions;
+
+import gnu.trove.map.hash.TObjectIntHashMap;
+import gnu.trove.set.hash.THashSet;
+import gnu.trove.set.hash.TIntHashSet;
+
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
+import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.exceptions.MatchException;
+
+public abstract class ASTExpression extends SimplifiableExpression {
+    public ASTExpression() {
+    }
+    
+    @Override
+    final public Expression simplify(SimplificationContext context) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support simplify.");
+    }
+    
+    @Override
+    final public void collectFreeVariables(THashSet<Variable> vars) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support collectFreeVariables.");
+
+    }
+    
+    @Override
+    final public void collectRefs(TObjectIntHashMap<Object> allRefs,
+            TIntHashSet refs) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support collectRefs.");
+    }
+    
+    @Override
+    final public void collectVars(TObjectIntHashMap<Variable> allVars,
+            TIntHashSet vars) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support collectVars.");
+    }
+    
+    @Override
+    final protected void updateType() throws MatchException {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support updateType.");
+    }
+    
+    @Override
+    final public Expression decorate(ExpressionDecorator decorator) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support decorate.");
+    }
+    
+    @Override
+    final public void collectEffects(THashSet<Type> effects) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support collectEffects.");
+    }
+    
+    @Override
+    final public void accept(ExpressionVisitor visitor) {
+        throw new InternalCompilerError(getClass().getSimpleName() + " does not support accept.");
+    }
+    
+    @Override
+    public Expression checkBasicType(TypingContext context, Type requiredType) {
+        throw new InternalCompilerError("Class " + 
+                getClass().getSimpleName() + " does not implement method checkBasicType.");
+    }
+    
+    @Override
+    public Expression inferType(TypingContext context) {
+        throw new InternalCompilerError("Class " + 
+                getClass().getSimpleName() + " does not implement method inferType.");
+    }
+    
+    @Override
+    public void forVariables(VariableProcedure procedure) {
+        throw new InternalCompilerError("Class " + 
+                getClass().getSimpleName() + " does not implement method forVariables.");
+    }
+}