From c6e37529771dc55d29d26c8a9026bbf0f911ff03 Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Sun, 6 Oct 2024 22:25:10 +0200
Subject: [PATCH] Fix #3089: Add comment regarding .constraint prefix expressed
 as cast in C#

---
 .../TestCases/Pretty/ConstructorInitializers.cs               | 4 ++++
 ICSharpCode.Decompiler/CSharp/CallBuilder.cs                  | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/ICSharpCode.Decompiler.Tests/TestCases/Pretty/ConstructorInitializers.cs b/ICSharpCode.Decompiler.Tests/TestCases/Pretty/ConstructorInitializers.cs
index 5b08837a0..7e8650ff6 100644
--- a/ICSharpCode.Decompiler.Tests/TestCases/Pretty/ConstructorInitializers.cs
+++ b/ICSharpCode.Decompiler.Tests/TestCases/Pretty/ConstructorInitializers.cs
@@ -60,7 +60,11 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 		public class MethodCallInCtorInit
 		{
 			public MethodCallInCtorInit(ConsoleKey key)
+#if MCS5
+				: this(((int)key/*cast due to .constrained prefix*/).ToString())
+#else
 				: this(((int)key).ToString())
+#endif
 			{
 			}
 
diff --git a/ICSharpCode.Decompiler/CSharp/CallBuilder.cs b/ICSharpCode.Decompiler/CSharp/CallBuilder.cs
index 56f420e07..fb46b12ea 100644
--- a/ICSharpCode.Decompiler/CSharp/CallBuilder.cs
+++ b/ICSharpCode.Decompiler/CSharp/CallBuilder.cs
@@ -507,6 +507,10 @@ namespace ICSharpCode.Decompiler.CSharp
 					targetExpr = new MemberReferenceExpression(castExpression, methodName);
 					typeArgumentList = ((MemberReferenceExpression)targetExpr).TypeArguments;
 				}
+				if (constrainedTo != null && targetExpr is MemberReferenceExpression { Target: CastExpression cast })
+				{
+					cast.AddChild(new Comment("cast due to .constrained prefix", CommentType.MultiLine), Roles.Comment);
+				}
 			}
 			else
 			{