Fix missing semicolon on non-const global struct initializers

sources/ClangSharp.PInvokeGenerator/CSharp/CSharpOutputBuilder.VisitDecl.cs

@@ -224,6 +224,10 @@ public void EndValue(in ValueDesc desc)
                         WriteLine(';');
                     }
                 }
+                else
+                {
+                    WriteLine(';');
+                }
                 break;
             }
 

tests/ClangSharp.PInvokeGenerator.UnitTests/GlobalStructInitializerTest.cs

@@ -0,0 +1,43 @@
+// Copyright (c) .NET Foundation and Contributors. All Rights Reserved. Licensed under the MIT License (MIT). See License.md in the repository root for more information.
+
+using System.Threading.Tasks;
+using NUnit.Framework;
+
+namespace ClangSharp.UnitTests;
+
+public sealed class GlobalStructInitializerTest : PInvokeGeneratorTest
+{
+    // Regression test for https://github.com/dotnet/clangsharp/issues/503
+    // A non-const global variable initialized with a struct initializer list was
+    // missing its terminating semicolon, which corrupted the rest of the file.
+    [Test]
+    public Task NonConstGlobalTest()
+    {
+        var inputContents = @"typedef struct Point { int x; int y; } Point;
+
+Point MyGlobalPoint = { .x = 10, .y = 20 };
+";
+
+        var expectedOutputContents = @"namespace ClangSharp.Test
+{
+    public partial struct Point
+    {
+        public int x;
+
+        public int y;
+    }
+
+    public static partial class Methods
+    {
+        public static Point MyGlobalPoint = new Point
+        {
+            x = 10,
+            y = 20,
+        };
+    }
+}
+";
+
+        return ValidateGeneratedCSharpLatestWindowsBindingsAsync(inputContents, expectedOutputContents);
+    }
+}