gistfile1.txt

$ cargo build
   Compiling foo v0.1.0 (/Users/akesling/Devel/rust/tonic-break/foobar)
error[E0428]: the name `client` is defined multiple times
  --> /Users/akesling/Devel/rust/tonic-break/foobar/target/debug/build/foo-f7fc2b277b67ed62/out/example.foobar.v1.rs:89:1
   |
17 | pub mod client {
   | -------------- previous definition of the module `client` here
...
89 | pub mod client {
   | ^^^^^^^^^^^^^^ `client` redefined here
   |
   = note: `client` must be defined only once in the type namespace of this module

error: aborting due to previous error

For more information about this error, try `rustc --explain E0428`.
error: could not compile `foo`.

To learn more, run the command again with --verbose.