Complex number with imaginary part cannot be converted to Float

test/Base_Tests/src/Main.enso

@@ -11,6 +11,7 @@ import project.Semantic.Import_Loop.Spec as Import_Loop_Spec
 import project.Semantic.Meta_Spec
 import project.Semantic.Instrumentor_Spec
 import project.Semantic.Meta_Location_Spec
+import project.Semantic.Multi_Value_Spec
 import project.Semantic.Names_Spec
 import project.Semantic.Equals_Spec
 import project.Semantic.Runtime_Spec
@@ -132,6 +133,7 @@ main filter=Nothing =
         Meta_Spec.add_specs suite_builder
         Instrumentor_Spec.add_specs suite_builder
         Meta_Location_Spec.add_specs suite_builder
+        Multi_Value_Spec.add_specs suite_builder
         Names_Spec.add_specs suite_builder
         Numbers_Spec.add_specs suite_builder
         Equals_Spec.add_specs suite_builder

test/Base_Tests/src/Semantic/Multi_Value_Spec.enso

@@ -0,0 +1,16 @@
+from Standard.Base import all
+from Standard.Test import all
+import Standard.Base.Errors.Common.Type_Error
+
+import project.Data.Complex.Complex
+
+add_specs suite_builder =
+    suite_builder.group "Complex Multi Value" group_builder->
+        group_builder.specify "Cannot convert to flow if it has imaginary part" <|
+            c = Complex.new 1 5
+            Test.expect_panic Type_Error (c:Float)
+
+main filter=Nothing =
+    suite = Test.build suite_builder->
+        add_specs suite_builder
+    suite.run_with_filter filter