MA0109: Skip diagnostic for program entry point Main(string[] args)

docs/Rules/MA0109.md

@@ -11,3 +11,5 @@ void A(System.ReadOnlySpan<string> a) { }
 ````c#
 void A(string[] a) { } // report diagnostic
 ````
+
+The rule does not report a diagnostic for the program entry point (`Main(string[] args)`), as its signature is mandated by the runtime.

src/Meziantou.Analyzer/Rules/AddOverloadWithSpanOrMemoryAnalyzer.cs

@@ -40,6 +40,10 @@ private static void AnalyzeMethod(SymbolAnalysisContext context)
         if (method.MethodKind is not MethodKind.Ordinary and not MethodKind.Constructor)
             return;
 
+        // Skip the program entry point (e.g., Main(string[] args)) as the signature is mandated by the runtime
+        if (method.IsEqualTo(context.Compilation.GetEntryPoint(context.CancellationToken)))
+            return;
+
         if (!method.Parameters.Any(IsCandidateForSpanOrMemory))
             return;
 

tests/Meziantou.Analyzer.Test/Rules/AddOverloadWithSpanOrMemoryAnalyzerTests.cs

@@ -13,6 +13,37 @@ private static ProjectBuilder CreateProjectBuilder()
             .WithAnalyzer<AddOverloadWithSpanOrMemoryAnalyzer>();
     }
 
+    [Fact]
+    public async Task EntryPoint_Main_ShouldNotTrigger()
+    {
+        const string SourceCode = """
+            public class Program
+            {
+                public static void Main(string[] args) { }
+            }
+            """;
+        await CreateProjectBuilder()
+              .WithOutputKind(Microsoft.CodeAnalysis.OutputKind.ConsoleApplication)
+              .WithSourceCode(SourceCode)
+              .ValidateAsync();
+    }
+
+    [Fact]
+    public async Task EntryPoint_NonMainMethod_ShouldTrigger()
+    {
+        const string SourceCode = """
+            public class Program
+            {
+                public static void Main(string[] args) { }
+                public static void [|DoWork|](string[] data) { }
+            }
+            """;
+        await CreateProjectBuilder()
+              .WithOutputKind(Microsoft.CodeAnalysis.OutputKind.ConsoleApplication)
+              .WithSourceCode(SourceCode)
+              .ValidateAsync();
+    }
+
     [Fact]
     public async Task StringArrayWithoutSpanOverload_Params()
     {