Failing builds due to missing protobuf dependency

[goodspark]

Hi, looks like the commit that the protobuf submodule is pinned to is now missing and it's causing builds to fail:

Updating git submodule `https://github.com/google/protobuf`
  | error: failed to get `protobuf` as a dependency of package `pigeon-build v0.2.0 (XYZ)`
  |  
  | Caused by:
  | failed to load source for dependency `protobuf`
  |  
  | Caused by:
  | Unable to update https://github.com/stepancheg/rust-protobuf#681462cc
  |  
  | Caused by:
  | failed to update submodule `google-protobuf`
  |  
  | Caused by:
  | object not found - no match for id (b5fbb742af122b565925987e65c08957739976a7); class=Odb (9); code=NotFound (-3)
  | Updating git submodule `https://github.com/google/protobuf`

[samschlegel]

Seems to be something related to rust-lang/cargo#4007, not specific to this package

[goodspark]

Closing, looks like this is some corrupted local cache issue. Sorry!