diff --git a/schala-lang/language/src/reduced_ir/mod.rs b/schala-lang/language/src/reduced_ir/mod.rs
index f6f43a2..67bd8ad 100644
--- a/schala-lang/language/src/reduced_ir/mod.rs
+++ b/schala-lang/language/src/reduced_ir/mod.rs
@@ -225,7 +225,7 @@ impl<'a> Reducer<'a> {
             GlobalBinding => Expression::Lookup(Lookup::GlobalVar(def_id.unwrap())),
             LocalVariable => Expression::Lookup(Lookup::LocalVar(def_id.unwrap())),
             FunctionParam(n) => Expression::Lookup(Lookup::Param(n)),
-            DataConstructor { .. } => {
+            DataConstructor { index, arity, type_id } => {
                 Expression::ReductionError("DataConstructor not supported".to_string())
             },
             RecordConstructor { .. } => {
diff --git a/schala-lang/language/src/tree_walk_eval/test.rs b/schala-lang/language/src/tree_walk_eval/test.rs
index aef4ca5..828b491 100644
--- a/schala-lang/language/src/tree_walk_eval/test.rs
+++ b/schala-lang/language/src/tree_walk_eval/test.rs
@@ -5,6 +5,7 @@ use crate::tree_walk_eval::State;
 
 fn evaluate_input(input: &str) -> Result<String, String> {
   let ast = crate::util::quick_ast(input);
+  println!("AST: {:?}", ast);
   let mut symbol_table = SymbolTable::new();
   symbol_table.process_ast(&ast).unwrap();
   let reduced_ir = crate::reduced_ir::reduce(&ast, &symbol_table);
@@ -62,6 +63,18 @@ fn scopes() {
     eval_assert(scope_ok, "20");
 }
 
+#[test]
+fn adt_output_1() {
+    let source = r#"
+
+type Option<T> = Some(T) | None
+let x = Option::Some(10)
+x
+"#;
+    eval_assert(source, "Option::Some(10)");
+}
+
+/*
 #[test]
 fn if_is_patterns() {
   let source = r#"
@@ -75,7 +88,7 @@ type Option<T> = Some(T) | None
 let x = Option::None; if x is Option::Some(q) then { q } else { 0 }"#;
   eval_assert(source, "0");
 }
-
+*/
 
 
 #[test]