error: detected cyclic import while importing "foo/v1/bar.proto"
  --> foo/v1/foo.proto:4:1
   |
 4 | import "foo/v1/bar.proto";
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ imported here
   |
  ::: foo/v1/foo.proto:5:1
   |
 5 | import "foo/v2/foo.proto";
   | -------------------------- ...which imports "foo/v2/foo.proto"...
   |
  ::: foo/v2/foo.proto:4:1
   |
 4 | import "foo/v1/bar.proto";
   | --------------------------
   |  |
   |  ...which imports "foo/v1/bar.proto", completing the cycle

encountered 1 error
