diff --git a/example/dart_eval_example.dart b/example/dart_eval_example.dart
index 6795936..9af9544 100644
--- a/example/dart_eval_example.dart
+++ b/example/dart_eval_example.dart
@@ -62,31 +62,39 @@ void main(List<String> args) {
   // Compile the source code into a Program containing metadata and bytecode.
   // In a real app, you could also compile the Eval code separately and output
   // it to a file using program.write().
-  final program = compiler.compile({
-    'example': {'main.dart': source}
-  });
+  try {
+    final program = compiler.compile({
+      'example': {'main.dart': source}
+    });
 
-  // Create a runtime from the compiled program, and register bridge functions
-  // for all static methods and constructors. Default constructors use
-  // "ClassName." syntax.
-  final runtime = Runtime.ofProgram(program)
-    ..registerBridgeFunc('package:example/bridge.dart', 'TimestampedTime.',
-        $TimestampedTime.$new)
-    ..registerBridgeFunc('package:example/bridge.dart', 'WorldTimeTracker.',
-        $WorldTimeTracker$bridge.$new,
-        isBridge: true);
+    // Create a runtime from the compiled program, and register bridge functions
+    // for all static methods and constructors. Default constructors use
+    // "ClassName." syntax.
 
-  // Call the function and cast the result to the desired type
-  final timeTracker = runtime.executeLib(
-    'package:example/main.dart',
-    'fn',
-    // Wrap args in $Value wrappers except int, double, bool, and List
-    [$String('USA')],
-  ) as WorldTimeTracker;
+    final runtime = Runtime.ofProgram(program)
+      ..registerBridgeFunc('package:example/bridge.dart', 'TimestampedTime.',
+          $TimestampedTime.$new)
+      ..registerBridgeFunc('package:example/bridge.dart', 'WorldTimeTracker.',
+          $WorldTimeTracker$bridge.$new,
+          isBridge: true);
 
-  // We can now utilize the returned bridge class
-  print('UK timezone offset: ${timeTracker.getTimeFor('UK').timezoneOffset}'
-      ' (from outside Eval!)');
+    // Call the function and cast the result to the desired type
+    final timeTracker = runtime.executeLib(
+      'package:example/main.dart',
+      'fn',
+      // Wrap args in $Value wrappers except int, double, bool, and List
+      [$String('USA')],
+    ) as WorldTimeTracker;
+
+    // We can now utilize the returned bridge class
+    print('UK timezone offset: ${timeTracker.getTimeFor('UK').timezoneOffset}'
+        ' (from outside Eval!)');
+  } catch (e) {
+    if (e is CompileError) {
+      print(e.message);
+    }
+    print(e.toString());
+  }
 }
 
 /// Create a wrapper for [TimestampedTime]. A wrapper is a performant interop
diff --git a/lib/dart_eval.dart b/lib/dart_eval.dart
index b873b8f..482e3b4 100644
--- a/lib/dart_eval.dart
+++ b/lib/dart_eval.dart
@@ -5,4 +5,5 @@ export 'src/eval/eval.dart';
 export 'src/eval/runtime/runtime.dart' show Runtime;
 export 'src/eval/compiler/compiler.dart';
 export 'src/eval/compiler/program.dart';
+export 'src/eval/compiler/errors.dart' hide NotReferencableError;
 export 'src/eval/runtime/override.dart' hide runtimeOverride;
diff --git a/lib/src/eval/runtime/runtime.dart b/lib/src/eval/runtime/runtime.dart
index 6f77880..5cdd7e2 100644
--- a/lib/src/eval/runtime/runtime.dart
+++ b/lib/src/eval/runtime/runtime.dart
@@ -9,7 +9,9 @@ import 'package:dart_eval/dart_eval_security.dart';
 import 'package:dart_eval/src/eval/bridge/runtime_bridge.dart';
 import 'package:dart_eval/src/eval/compiler/model/override_spec.dart';
 import 'package:dart_eval/src/eval/runtime/class.dart';
+import 'package:dart_eval/src/eval/runtime/continuation.dart';
 import 'package:dart_eval/src/eval/runtime/function.dart';
+import 'package:dart_eval/src/eval/runtime/type.dart';
 import 'package:dart_eval/src/eval/shared/stdlib/async.dart';
 import 'package:dart_eval/src/eval/shared/stdlib/collection.dart';
 import 'package:dart_eval/src/eval/shared/stdlib/convert.dart';
@@ -19,21 +21,15 @@ import 'package:dart_eval/src/eval/shared/stdlib/io.dart';
 import 'package:dart_eval/src/eval/shared/stdlib/math.dart';
 import 'package:dart_eval/src/eval/shared/stdlib/typed_data.dart';
 import 'package:dart_eval/stdlib/core.dart';
-import 'package:dart_eval/src/eval/runtime/continuation.dart';
-import 'package:dart_eval/src/eval/runtime/type.dart';
 
 import 'exception.dart';
 import 'ops/all_ops.dart';
 
-part 'ops/primitives.dart';
-
-part 'ops/memory.dart';
-
+part 'ops/bridge.dart';
 part 'ops/flow.dart';
-
+part 'ops/memory.dart';
 part 'ops/objects.dart';
-
-part 'ops/bridge.dart';
+part 'ops/primitives.dart';
 
 typedef TypeAutowrapper = $Value? Function(dynamic);
 
@@ -61,6 +57,7 @@ class _UnloadedBridgeFunction {
 
 class _UnloadedEnumValues {
   const _UnloadedEnumValues(this.library, this.name, this.values);
+
   final String library;
   final String name;
   final Map<String, $Value> values;
@@ -103,6 +100,7 @@ class Runtime {
 
   /// Create a [Runtime] from a [Program]. This constructor should be preferred
   /// where possible as it avoids overhead of loading bytecode.
+  ///CompileError will be be thrown when there's an error
   Runtime.ofProgram(Program program)
       : id = _id++,
         _fromEvc = false,
@@ -808,6 +806,7 @@ class Runtime {
 
   var declarations = <int, Map<String, int>>{};
   final declaredClasses = <int, Map<String, EvalClass>>{};
+
   //late final List<String> typeNames;
   late final List<Set<int>> typeTypes;
   late final Map<int, Map<String, int>> typeIds;