Phase 2: hand search for errors.

Copilot didn't find any errors related to `fixed` buffers.

Author: BillWagner

.openpublishing.redirection.csharp.json

@@ -1677,6 +1677,26 @@
             "source_path_from_root": "/docs/csharp/misc/cs0233.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
         },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs0242.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs0244.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs0254.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs0459.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs0821.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
         {
             "source_path_from_root": "/docs/csharp/misc/cs0217.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/overloaded-operator-errors"
@@ -2217,6 +2237,14 @@
             "source_path_from_root": "/docs/csharp/misc/cs1637.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/iterator-yield"
         },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs1641.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs1642.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
         {
             "source_path_from_root": "/docs/csharp/misc/cs1649.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/ref-modifiers-errors"
@@ -2229,6 +2257,18 @@
             "source_path_from_root": "/docs/csharp/misc/cs1655.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/ref-modifiers-errors"
         },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs1663.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs1665.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
+        {
+            "source_path_from_root": "/docs/csharp/misc/cs1666.md",
+            "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/unsafe-code-errors"
+        },
         {
             "source_path_from_root": "/docs/csharp/misc/cs1657.md",
             "redirect_url": "/dotnet/csharp/language-reference/compiler-messages/ref-modifiers-errors"