project1 (project1)
|--module1 (project1/module1.nit)
|--module3 (project1/module3.nit) (module4)
`--subdir (project1/subdir)
   |--module4 (project1/subdir/module4.nit) (module1)
   `--subdir2 (project1/subdir/subdir2)
      `--subdir3 (project1/subdir/subdir2/subdir3)
         `--submodule (project1/subdir/subdir2/subdir3/submodule.nit)