Use file-scoped namespace.

Author: timcassell

src/BenchmarkDotNet/Diagnosers/InProcessDiagnoserRouter.cs

@@ -3,23 +3,22 @@
 using JetBrains.Annotations;
 using System.ComponentModel;
 
-namespace BenchmarkDotNet.Diagnosers
+namespace BenchmarkDotNet.Diagnosers;
+
+[UsedImplicitly]
+[EditorBrowsable(EditorBrowsableState.Never)]
+public struct InProcessDiagnoserRouter
 {
-    [UsedImplicitly]
-    [EditorBrowsable(EditorBrowsableState.Never)]
-    public struct InProcessDiagnoserRouter
-    {
-        public IInProcessDiagnoserHandler handler;
-        public int index;
-        public RunMode runMode;
+    public IInProcessDiagnoserHandler handler;
+    public int index;
+    public RunMode runMode;
 
-        public readonly string ToSourceCode()
-            => $$"""
-                new {{typeof(InProcessDiagnoserRouter).GetCorrectCSharpTypeName()}}() {
-                    {{nameof(handler)}} = {{handler.ToSourceCode()}},
-                    {{nameof(index)}} = {{index}},
-                    {{nameof(runMode)}} = {{SourceCodeHelper.ToSourceCode(runMode)}}
-                }
-                """;
-    }
+    public readonly string ToSourceCode()
+        => $$"""
+            new {{typeof(InProcessDiagnoserRouter).GetCorrectCSharpTypeName()}}() {
+                {{nameof(handler)}} = {{handler.ToSourceCode()}},
+                {{nameof(index)}} = {{index}},
+                {{nameof(runMode)}} = {{SourceCodeHelper.ToSourceCode(runMode)}}
+            }
+            """;
 }