Workaround potential compiler nullability bug

Commit migrated from https://github.com/dotnet/corefx/commit/5e3b0ae04986e9527eb51d3717ab96727c215c03

diff --git a/src/libraries/System.Memory/src/System/Buffers/ReadOnlySequence.cs b/src/libraries/System.Memory/src/System/Buffers/ReadOnlySequence.cs
index c9f6d52..a9d6179 100644 (file)
--- a/src/libraries/System.Memory/src/System/Buffers/ReadOnlySequence.cs
+++ b/src/libraries/System.Memory/src/System/Buffers/ReadOnlySequence.cs
@@ -146,7 +146,9 @@ namespace System.Buffers
         /// </summary>
         public ReadOnlySequence(ReadOnlyMemory<T> memory)
         {
+#pragma warning disable CS8631 // TODO-NULLABLE: Unexpected compiler error: https://github.com/dotnet/corefx/pull/38983#issuecomment-506757237
             if (MemoryMarshal.TryGetMemoryManager(memory, out MemoryManager<T>? manager, out int index, out int length))
+#pragma warning restore CS8631
             {
                 _startObject = manager;
                 _endObject = manager;