https://github.com/dotnet/roslyn/blob/cf55f3a58e47298426fa971d3bd9d8857c746c65/src/Features/Core/Portable/ConvertAnonymousTypeToClass/AbstractConvertAnonymousTypeToClassCodeRefactoringProvider.cs#L27 (Done)

This is the language-agnostic layer, namespaces shouldn't contain "CSharp" or "VisualBasic".

Noted that while looking at the VB-specific code.

https://github.com/dotnet/roslyn/blob/03c34759fc1cbb1771967f27a7e25d79cece69af/src/Features/VisualBasic/Portable/ConvertAnonymousTypeToClass/VisualBasicConvertAnonymousTypeToClassCodeRefactoringProvider.vb#L8 (Done)

https://github.com/dotnet/roslyn/blob/87bd913b9edb92dec0b2ec2f3bdac48b263610bb/src/Features/Core/Portable/Completion/Providers/AbstractPreprocessorCompletionProvider.cs#L15-L17 (Done)

This one is very confusing:

• Namespace: CSharp
• Implementation: VisualBasic
  -Layer: language-agnostic