2021.2/CSharp20212/NullableReferenceTypes/ChangeNullability.cs
2021.3/CS10/Namespaces/BlockScoped/BlockScopedNamespace.cs

2021.2/CSharp20212/NullableReferenceTypes/ChangeNullability.cs
2021.3/CS10/Namespaces/FileScoped/FileScopedNamespace.cs