diff --git a/src/Compilers/CSharp/Test/Semantic/Semantics/PatternMatchingTests_ListPatterns.cs b/src/Compilers/CSharp/Test/Semantic/Semantics/PatternMatchingTests_ListPatterns.cs
index 438621cf156cc..9724df2d6cd3f 100644
--- a/src/Compilers/CSharp/Test/Semantic/Semantics/PatternMatchingTests_ListPatterns.cs
+++ b/src/Compilers/CSharp/Test/Semantic/Semantics/PatternMatchingTests_ListPatterns.cs
@@ -5626,6 +5626,36 @@ public void Subsumption_Slice_03()
                 );
     }
 
+    [Fact]
+    public void Subsumption_Slice_04()
+    {
+        var source = @"
+#nullable enable
+class C
+{
+    public int Length => 3;
+    public int this[int i] => 0;
+    public int[]? Slice(int i, int j) => null;
+
+    public static void Main()
+    {
+        switch (new C())
+        {
+            case [.. {}]:
+                break;
+            case [.. null]:
+                break;
+        }
+    }
+}
+";
+        var compilation = CreateCompilation(source, options: TestOptions.ReleaseExe);
+        compilation.VerifyEmitDiagnostics(
+                    // (15,18): error CS8120: The switch case is unreachable. It has already been handled by a previous case or it is impossible to match.
+                    //             case [.. null]:
+                    Diagnostic(ErrorCode.ERR_SwitchCaseSubsumed, "[.. null]").WithLocation(15, 18));
+    }
+
     [Fact]
     public void Exhaustiveness_01()
     {