Interceptors

Feature specification has been moved to https://github.com/dotnet/roslyn/blob/main/docs/features/interceptors.md. As this is not currently implemented as a language feature, we will not be tracking specific status pieces on this issue.

Design meetings

• https://github.com/dotnet/csharplang/blob/main/meetings/2023/LDM-2023-02-27.md
• https://github.com/dotnet/csharplang/blob/main/meetings/2023/LDM-2023-07-12.md#interceptors
• https://github.com/dotnet/csharplang/blob/main/meetings/2023/LDM-2023-07-24.md#interceptors