proto: remove shallow merge support, and MergeOptions

We're still debating what the semantics of shallow merges should be, and
what the use case for them (if any) is. There's no need to commit
ourselves to this feature at this time; drop it for now.

Remove the exported MergeOptions type, since the only option is gone. We
can trivially add it back in the future if we need it.

Change-Id: I4c8697cae69cc66eed1ea65de84b982f20e1be44
Reviewed-by: Joe Tsai <>
2 files changed
tree: 88c00234e8313ca8c5fbd2c30876ceb946b60c00
  1. .gitignore
  2. .travis.yml
  9. cmd/
  10. compiler/
  11. encoding/
  12. go.mod
  13. go.sum
  14. integration_test.go
  15. internal/
  16. proto/
  17. reflect/
  18. regenerate.bash
  19. release.bash
  20. runtime/
  21. test.bash
  22. testing/
  23. types/

Next Generation Go Protocol Buffers

WARNING: This repository is in active development. There are no guarantees about API stability. Breaking changes will occur until a stable release is made and announced.

This repository is for the development of the next major Go implementation of protocol buffers. This library makes breaking API changes relative to the existing Go protobuf library. Of particular note, this API aims to make protobuf reflection a first-class feature of the API and implements the protobuf ecosystem in terms of reflection.

Design Documents

List of relevant design documents:


We appreciate community contributions. See

Reporting Issues

Issues regarding the new API can be filed at Please use a APIv2: prefix in the title to make it clear that the issue is regarding the new API work.