Do not create object initializers for tuples

Author: ds5678

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -158,6 +158,7 @@
     <Compile Include="TestCases\Pretty\Issue3571_C.cs" />
     <Compile Include="TestCases\Pretty\Issue3571_B.cs" />
     <Compile Include="TestCases\Pretty\Issue3571_A.cs" />
+    <Compile Include="TestCases\Pretty\Issue3576.cs" />
     <None Include="TestCases\Ugly\NoLocalFunctions.Expected.cs" />
     <None Include="TestCases\ILPretty\Issue3504.cs" />
     <Compile Include="TestCases\ILPretty\MonoFixed.cs" />

ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs

@@ -696,6 +696,12 @@ public async Task Issue3571_C([ValueSource(nameof(roslyn2OrNewerWithNet40Options
 			await RunForLibrary(cscOptions: cscOptions);
 		}
 
+		[Test]
+		public async Task Issue3576([ValueSource(nameof(roslyn2OrNewerWithNet40Options))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary(cscOptions: cscOptions);
+		}
+
 		[Test]
 		public async Task AssemblyCustomAttributes([ValueSource(nameof(defaultOptions))] CompilerOptions cscOptions)
 		{

ICSharpCode.Decompiler.Tests/TestCases/Pretty/Issue3576.cs

@@ -0,0 +1,39 @@
+using System.Collections.Generic;
+
+namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
+{
+	internal static class Issue3576
+	{
+		public static Issue3576_Camera GetOrCreate(long key, int frameCount, Dictionary<long, (Issue3576_Camera, int)> cache)
+		{
+			if (!cache.TryGetValue(key, out var value))
+			{
+				Issue3576_GameObject issue3576_GameObject = new Issue3576_GameObject();
+				value = (issue3576_GameObject.AddComponent<Issue3576_Camera>(), frameCount);
+				value.Item1.Property = 1;
+				issue3576_GameObject.SetActive(value: false);
+				cache[key] = value;
+			}
+			else
+			{
+				value.Item2 = frameCount;
+				cache[key] = value;
+			}
+			return value.Item1;
+		}
+	}
+	internal sealed class Issue3576_Camera
+	{
+		public int Property { get; set; }
+	}
+	internal sealed class Issue3576_GameObject
+	{
+		public T AddComponent<T>()
+		{
+			throw null;
+		}
+		public void SetActive(bool value)
+		{
+		}
+	}
+}

ICSharpCode.Decompiler/IL/Transforms/TransformCollectionAndObjectInitializers.cs

@@ -69,6 +69,9 @@ void IStatementTransform.Run(Block block, int pos, StatementTransformContext con
 					// anon = new { A = 5 } { 3,4,5 } is invalid syntax.
 					if (newObjInst.Method.DeclaringType.ContainsAnonymousType())
 						return;
+					// Tuples cannot have initializers
+					if (TupleTransform.MatchTupleConstruction(newObjInst, out _))
+						return;
 					instType = newObjInst.Method.DeclaringType;
 					break;
 				case DefaultValue defaultVal: