 --> [ local path prefix ]/spec_loc/interface_path_error.fpp:1:23
  |
1 |   locate interface I at "incorrect.fpp"
  |                         ^^^^^^^^^^^^^^^ incorrect location path [ local path prefix ]/spec_loc/incorrect.fpp
  |
 ::: [ local path prefix ]/spec_loc/interface_path_error.fpp:3:1
  |
3 | / interface I {
4 | |
5 | | }
  | |_- actual location is here

