% ../dune/./_esy/default/store/b/dune-f684ad2b/install/default/bin/dune.exe clean
�[1;31mInternal error, please report upstream including the contents of _build/log.�[0m
Description:
  ("Path.rm_rf called on external dir",
  { fn =
      "C:/Users/Et7f3/ppx_import/_esy/default/store/b/ppx__import-e1393642"
  })
Raised at Stdune__Code_error.raise in file "otherlibs/stdune/code_error.ml",
  line 11, characters 30-62
Called from Stdune__Fpath.rm_rf in file "otherlibs/stdune/fpath.ml", line
  131, characters 4-78
Called from Cmdliner_term.app.(fun) in file
  "vendor/cmdliner/src/cmdliner_term.ml", line 25, characters 19-24
Called from Cmdliner.Term.run in file "vendor/cmdliner/src/cmdliner.ml", line
  117, characters 32-39
Called from Cmdliner.Term.term_eval in file
  "vendor/cmdliner/src/cmdliner.ml", line 147, characters 18-36
Called from Cmdliner.Term.Group.eval in file
  "vendor/cmdliner/src/cmdliner.ml", line 367, characters 22-48
Called from Dune__exe__Main in file "bin/main.ml", line 90, characters 10-50

I must not crash.  Uncertainty is the mind-killer. Exceptions are the
little-death that brings total obliteration.  I will fully express my cases.
Execution will pass over me and through me.  And when it has gone past, I
will unwind the stack along its path.  Where the cases are handled there will
be nothing.  Only I will remain.
[build ppx_import] % echo $DUNE_BUILD_DIR/
C:/Users/Et7f3/ppx_import/_esy/default/store/b/ppx__import-e1393642

% echo $DUNE_BUILD_DIR/
C:/Users/Et7f3/ppx_import/_esy/default/store/b/ppx__import-e1393642/
% echo $PWD
/cygdrive/c/Users/Et7f3/ppx_import