Go 1.6 has moved to vendoring for managing dependencies. However, godebug does not build when the package has vendored dependancies.
Here is the type of error message shown:
In godebug_tmp_folder/github.com/my_working_dir/my_repo/my_file.go
cannot use "github.com/popular_user/popular_lib".Fields
literal (type "github.com/popular_user/popular_lib".Fields)
as type "github.com/my_working_dir/my_repo/vendor/github.com/popular_user/popular_lib"