PR feedback

src/Compilers/Core/Portable/CodeAnalysisResourcesLocalizableErrorArgument.cs

@@ -30,7 +30,7 @@ public string ToString(string? format, IFormatProvider? formatProvider)
         {
             if (_targetResourceId != null)
             {
-                return CodeAnalysisResources.ResourceManager.GetString(_targetResourceId, formatProvider as System.Globalization.CultureInfo) ?? "";
+                return CodeAnalysisResources.ResourceManager.GetString(_targetResourceId, formatProvider as System.Globalization.CultureInfo) ?? string.Empty;
             }
 
             return string.Empty;

src/Compilers/Core/Portable/InternalUtilities/WeakList.cs

@@ -33,7 +33,7 @@ private void Resize()
             int firstDead = -1;
             for (int i = 0; i < _items.Length; i++)
             {
-                if (!_items[i].TryGetTarget(out var _))
+                if (!_items[i].TryGetTarget(out _))
                 {
                     if (firstDead == -1)
                     {
@@ -112,8 +112,7 @@ private void Compact(int firstDead, WeakReference<T>[] result)
             {
                 var item = _items[i];
 
-                T? target;
-                if (item.TryGetTarget(out target))
+                if (item.TryGetTarget(out _))
                 {
                     result[j++] = item;
                 }

src/Compilers/Core/Portable/TreeDumper.cs

@@ -205,7 +205,7 @@ protected virtual string DumperString(object o)
                 return symbol.ToDisplayString(SymbolDisplayFormat.TestFormat);
             }
 
-            return o?.ToString() ?? "";
+            return o.ToString() ?? "";
         }
     }