handling enum in CodePrinter.ToCode(this Type)

Author: Maksim Volkau

src/FastExpressionCompiler/FastExpressionCompiler.cs

@@ -11356,6 +11356,13 @@ public static string ToCode(this Type type,
                 type = type.GetElementType();
             }
 
+            if (type.IsEnum)
+            {
+                var result = !stripNamespace && !string.IsNullOrEmpty(type.Namespace) 
+                    ? string.Concat(type.Namespace, ".", type.Name) : type.Name;
+                return printType?.Invoke(type, result) ?? result;
+            }
+
             var buildInTypeString = type.GetPrimitiveTypeNameAliasOrNull();
             if (buildInTypeString != null)
             {

test/FastExpressionCompiler.IssueTests/Issue476_System_ExecutionEngineException_with_nullables_on_repeated_calls_to_ConcurrentDictionary copy.cs

@@ -33,7 +33,7 @@ public void Original_case(TestContext t)
         expr.PrintCSharp();
 
         var fs = expr.CompileSys();
-        fs.PrintIL();
+        fs.PrintIL(format: ILDecoder.ILFormat.AssertOpCodes);
 
         // make reader and advance to the Null token
         var reader = new Utf8JsonReader("null"u8);
@@ -45,7 +45,7 @@ public void Original_case(TestContext t)
         t.AreEqual(default, a);
 
         var ff = expr.CompileFast(false);
-        ff.PrintIL();
+        ff.PrintIL(format: ILDecoder.ILFormat.AssertOpCodes);
 
         var b = ff(ref reader);
         t.AreEqual(default, b);