error: import path cannot be empty
  --> testdata/imports/invalid.proto:19:8
   |
19 | import "";
   |        ^^

error: import path must be relative
  --> testdata/imports/invalid.proto:20:8
   |
20 | import "/root.proto";
   |        ^^^^^^^^^^^^^ this path begins with a `/`

error: imported file does not exist
  --> testdata/imports/invalid.proto:21:1
   |
21 | import "does_not_exist.proto";
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ imported here

encountered 3 errors
