imported package collision: "backoff" imported twice

[arjunsingri]

Actual behavior A clear and concise description of what the bug is.
When I run mockgen for my pb.go files, I get the error below:

2020/02/20 16:29:15 imported package collision: "backoff" imported twice

Expected behavior A clear and concise description of what you expected to
happen.
No error is generated and the mocks are generated as well.

To Reproduce Steps to reproduce the behavior

1. Install mockgen 1.4
2. Generate mocks using the command below:

mockgen -source=./file.pb.go -package=mock

Additional Information

• gomock mode (reflect or source): tried both
• gomock version or git ref: 1.4.0
• golang version: tried with go1.11 and go1.13

[codyoss]

Could you please provide us a small code snippet of what a file.pb.go looks like so I can try to reproduce this?

[codyoss]

Closing this as a dupe of #156. Lets move all relevant discussion there.