"file private" visibility

• Proposed
• Prototype: Not Started
• Implementation: Not Started
• Specification: https://github.com/dotnet/csharplang/blob/main/proposals/csharp-11.0/file-local-types.md

Design meetings

• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-03-14.md#file-private-visibility
• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-03-21.md#file-private-visibility
• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-03-30.md#file-private-accessibility
• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-04-13.md#file-scoped-types