IBufferMessage Missing in 3.12.3

[Zehua-Chen]

What version of protobuf and what language are you using?
Version: 3.12.3.
Language: C#

What operating system (Linux, Windows, ...) and version?

macOS 10.15.5

What runtime / compiler are you using (e.g., python version or gcc version)

• protoc version 3.12.3
• Unity 2019.2.11f1
• API Compatibility Level: .Net Standard 2.0

What did you do?
Steps to reproduce the behavior:

1. Compile .proto files using protoc
2. Download packages from NuGet and find dll files under netstandard2.0 folder:
   • Google.Protobuf
   • System.Memory
   • System.Buffers
3. Import the dll files into Unity
4. See compiler error saying that IBufferMessage is missing

What did you expect to see

No compiler errors

What did you see instead?

Compiler error saying that IBufferMessage is missing

Anything else we should know about your project / environment

If I clone the repo and checkout v3.12.3, build it on my own machine, import the dlls, then there are no errors. But if I use the dll I got from NuGet, then there are errors

[sylv256]

I'm having the same issue as well.

[sylv256]

It appears that ParseContext is also missing from 3.12.3

[sylv256]

ReadRawMessage is missing as well. Is this an older version of protobuf?

[haberman]

The 3.12.3 release was broken; the wrong branch was tagged, which led to lots of unfortunate breakage. I think we can likely attribute this brokenness to that. Please re-open if you can reproduce this error with 3.12.4.