Add struct test case.

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

@@ -108,6 +108,7 @@
     <Compile Include="TestCases\Correctness\DeconstructionTests.cs" />
     <Compile Include="TestCases\Correctness\DynamicTests.cs" />
     <Compile Include="TestCases\Correctness\StringConcat.cs" />
+    <Compile Include="TestCases\Pretty\Structs.cs" />
     <None Include="TestCases\Pretty\FileScopedNamespaces.cs" />
     <Compile Include="TestCases\Pretty\PatternMatching.cs" />
     <None Include="TestCases\Ugly\NoPropertiesAndEvents.Expected.cs" />

ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs

@@ -441,6 +441,12 @@ namespace ICSharpCode.Decompiler.Tests
 			RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings());
 		}
 
+		[Test]
+		public void Structs([ValueSource(nameof(defaultOptionsWithMcs))] CompilerOptions cscOptions)
+		{
+			RunForLibrary(cscOptions: cscOptions);
+		}
+
 		[Test]
 		public void FunctionPointers([ValueSource(nameof(roslynLatestOnlyOptions))] CompilerOptions cscOptions)
 		{

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

@@ -0,0 +1,54 @@
+// Copyright (c) 2021 Siegfried Pammer
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System.Runtime.InteropServices;
+
+namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
+{
+	[StructLayout(LayoutKind.Sequential, Size = 1)]
+	public struct EmptyStruct
+	{
+	}
+
+	public class Structs
+	{
+#if CS100
+		public StructWithDefaultCtor M()
+		{
+			return default(StructWithDefaultCtor);
+		}
+
+		public StructWithDefaultCtor M2()
+		{
+			return new StructWithDefaultCtor();
+		}
+#endif
+	}
+
+#if CS100
+	public struct StructWithDefaultCtor
+	{
+		public int X;
+
+		public StructWithDefaultCtor()
+		{
+			X = 42;
+		}
+	}
+#endif
+}