diff --git a/schala-lang/language/src/reduced_ir/mod.rs b/schala-lang/language/src/reduced_ir/mod.rs
index 849b8d0..35939ee 100644
--- a/schala-lang/language/src/reduced_ir/mod.rs
+++ b/schala-lang/language/src/reduced_ir/mod.rs
@@ -108,7 +108,6 @@ impl<'a> Reducer<'a> {
 
     fn expression(&mut self, expr: &ast::Expression) -> Expression {
         use crate::ast::ExpressionKind::*;
-        use Expression::{Unimplemented};
 
         match &expr.kind {
             NatLiteral(n) => Expression::Literal(Literal::Nat(*n)),
@@ -133,11 +132,11 @@ impl<'a> Reducer<'a> {
                     body: self.function(body),
                 })
             },
-            NamedStruct { name, fields } => Unimplemented, //self.reduce_named_struct(name, fields),
-            Index { .. } => Unimplemented,
-            WhileExpression { .. } => Unimplemented,
-            ForExpression { .. } => Unimplemented,
-            ListLiteral { .. } => Unimplemented,
+            NamedStruct { name, fields } => Expression::ReductionError("NamedStruct not implemented".to_string()), //self.reduce_named_struct(name, fields),
+            Index { .. } => Expression::ReductionError("Index expr not implemented".to_string()),
+            WhileExpression { .. } => Expression::ReductionError("While expr not implemented".to_string()),
+            ForExpression { .. } => Expression::ReductionError("For expr not implemented".to_string()),
+            ListLiteral { .. } => Expression::ReductionError("ListLiteral expr not implemented".to_string()),
         }
     }
 
@@ -169,7 +168,7 @@ impl<'a> Reducer<'a> {
             }
             None => {
                 //TODO need this for custom prefix ops
-                Expression::Unimplemented
+                Expression::ReductionError("User-defined prefix ops not supported".to_string())
             }
         }
     }
@@ -203,7 +202,7 @@ impl<'a> Reducer<'a> {
             }
             None => {
                 //TODO handle a user-defined operation
-                Unimplemented
+                ReductionError("User-defined operations not supported".to_string())
             }
         }
     }
@@ -224,7 +223,7 @@ impl<'a> Reducer<'a> {
             LocalVariable => Expression::Lookup { id: def_id.clone(), kind: Lookup::LocalVar },
             FunctionParam(n) => Expression::Lookup { id: def_id.clone(), kind: Lookup::Param(*n) },
             DataConstructor { index, arity, .. } => {
-                Expression::Unimplemented
+                Expression::ReductionError("DataConstructor not supported".to_string())
             },
             RecordConstructor { .. } => {
                 Expression::ReductionError(format!("The symbol for value {:?} is unexpectdly a RecordConstructor", qualified_name))
diff --git a/schala-lang/language/src/reduced_ir/types.rs b/schala-lang/language/src/reduced_ir/types.rs
index 273f174..9486b87 100644
--- a/schala-lang/language/src/reduced_ir/types.rs
+++ b/schala-lang/language/src/reduced_ir/types.rs
@@ -62,7 +62,6 @@ pub enum Expression {
         f: Box<Expression>,
         args: Vec<Expression>
     },
-    Unimplemented,
     ReductionError(String),
 }
 
diff --git a/schala-lang/language/src/schala.rs b/schala-lang/language/src/schala.rs
index 5104add..d55f5a2 100644
--- a/schala-lang/language/src/schala.rs
+++ b/schala-lang/language/src/schala.rs
@@ -1,7 +1,7 @@
 use stopwatch::Stopwatch;
 
 use crate::error::SchalaError;
-use crate::{eval, parsing, reduced_ast, reduced_ir, tree_walk_eval, symbol_table, tokenizing, typechecking};
+use crate::{eval, parsing, reduced_ir, tree_walk_eval, symbol_table, tokenizing, typechecking};
 use schala_repl::{
     ComputationRequest, ComputationResponse, GlobalOutputStats, LangMetaRequest, LangMetaResponse,
     ProgrammingLanguageInterface,