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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/ssa/exits/Throw.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/ssa/exits/Throw.java
new file mode 100644
index 000000000..3af6a0073
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/ssa/exits/Throw.java
@@ -0,0 +1,81 @@
+package org.simantics.scl.compiler.internal.codegen.ssa.exits;
+
+import java.util.ArrayList;
+
+import org.cojen.classfile.TypeDesc;
+import org.simantics.scl.compiler.internal.codegen.continuations.Cont;
+import org.simantics.scl.compiler.internal.codegen.continuations.ContRef;
+import org.simantics.scl.compiler.internal.codegen.references.Val;
+import org.simantics.scl.compiler.internal.codegen.references.ValRef;
+import org.simantics.scl.compiler.internal.codegen.ssa.SSABlock;
+import org.simantics.scl.compiler.internal.codegen.ssa.SSAExit;
+import org.simantics.scl.compiler.internal.codegen.ssa.SSAFunction;
+import org.simantics.scl.compiler.internal.codegen.utils.CopyContext;
+import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
+import org.simantics.scl.compiler.internal.codegen.utils.PrintingContext;
+import org.simantics.scl.compiler.internal.codegen.utils.SSAValidationContext;
+import org.simantics.scl.compiler.types.TVar;
+import org.simantics.scl.compiler.types.Type;
+
+public class Throw extends SSAExit {
+
+    private static final TypeDesc RuntimeException = 
+            TypeDesc.forClass(RuntimeException.class);
+    
+    String description;
+    
+    public Throw(String description) {
+        this.description = description;
+    }
+
+    @Override
+    public void toString(PrintingContext context) {
+        context.append("throw\n");
+        //context.append(exception);
+    }
+
+    @Override
+    public void generateCode(MethodBuilder mb) {
+        //mb.push(exception.getBinding());
+        //cb.mapLineNumber(location);
+        mb.newObject(RuntimeException);
+        mb.dup();
+        mb.loadConstant(description);
+        mb.invokeConstructor(RuntimeException, new TypeDesc[] {TypeDesc.STRING});
+        mb.throwObject();
+    }
+
+    @Override
+    public void validate(SSAValidationContext context) {
+    }
+
+    @Override
+    public void destroy() {
+        // TODO
+    }
+
+    @Override
+    public SSAExit copy(CopyContext context) {
+        return new Throw(description);
+    }
+    
+    @Override
+    public void replace(TVar[] vars, Type[] replacements) {
+    }
+
+    @Override
+    public void collectFreeVariables(SSAFunction function,
+            ArrayList<ValRef> vars) {
+    }
+    
+    @Override
+    public Cont addParametersInFrontOf(ContRef contRef, Val[] newParameters, Val[] oldParameters,
+            Cont proxy) {
+        return proxy;
+    }
+
+    @Override
+    public SSABlock[] getSuccessors() {
+        return SSABlock.EMPTY_ARRAY;
+    }
+}