 --> [ local path prefix ]/spec_loc/system_path_error.fpp:1:20
  |
1 | locate system S at "incorrect.fpp"
  |                    ^^^^^^^^^^^^^^^ incorrect location path [ local path prefix ]/spec_loc/incorrect.fpp
  |
 ::: [ local path prefix ]/spec_loc/system_path_error.fpp:4:1
  |
4 | system S: T
  | ----------- actual location is here

