output count of total and unique lambdas

Author: dadhi

src/FastExpressionCompiler/FastExpressionCompiler.cs

@@ -3580,7 +3580,7 @@ public static bool TryEmitConstant(ConstantExpression expr, Type exprType, ILGen
                     if (constValue != null)
                         ok = TryEmitConstant(closure.ContainsConstantsOrNestedLambdas(), exprType, constValue.GetType(), constValue, il, ref closure, byRefIndex);
                     else if (exprType.IsValueType)
-                         // null for a value type and yep, this is a proper way to emit the Nullable null
+                        // null for a value type and yep, this is a proper way to emit the Nullable null
                         ok = EmitLoadLocalVariable(il, InitValueTypeVariable(il, exprType));
                     else
                     {

src/FastExpressionCompiler/TestTools.cs

@@ -157,10 +157,17 @@ public static void PrintIL(this IDelegateDebugInfo diagInfo, [CallerMemberName]
         SmallMap4<IDelegateDebugInfo, string, RefEq<IDelegateDebugInfo>,
             SmallMap4.SingleArrayEntries<IDelegateDebugInfo, string, RefEq<IDelegateDebugInfo>>
         > uniquePrinted = default;
-        PrintIL(diagInfo, ref uniquePrinted, tag);
+        var totalNestedCount = 0;
+        PrintIL(diagInfo, ref totalNestedCount, ref uniquePrinted, tag);
+        if (totalNestedCount > 0)
+        {
+            Console.WriteLine("--------------------------------------");
+            Console.WriteLine($"Total nested lambdas: {totalNestedCount}, unique printed: {uniquePrinted.Count}");
+        }
     }
 
     private static void PrintIL(this IDelegateDebugInfo diagInfo,
+        ref int totalNestedCount,
         ref SmallMap4<IDelegateDebugInfo, string, RefEq<IDelegateDebugInfo>,
             SmallMap4.SingleArrayEntries<IDelegateDebugInfo, string, RefEq<IDelegateDebugInfo>>> uniquePrinted,
         [CallerMemberName] string tag = null)
@@ -176,9 +183,10 @@ private static void PrintIL(this IDelegateDebugInfo diagInfo,
             else
             {
                 printedTag = $"{n}_{tag}";
-                PrintIL(nested, ref uniquePrinted, printedTag);
+                PrintIL(nested, ref totalNestedCount, ref uniquePrinted, printedTag);
             }
             ++n;
+            ++totalNestedCount;
         }
     }