ppx artifacts
  $ dune build
  lib: [
    "_build/install/default/lib/foo/META"
    "_build/install/default/lib/foo/dune-package"
    "_build/install/default/lib/foo/opam"
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.a" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.a"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.cma" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.cma"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.cmi" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.cmi"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.cmt" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.cmt"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.cmx" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.cmx"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.cmxa" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.cmxa"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.ml" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.ml"}
  ]
  libexec: [
    "_build/install/default/lib/foo/ppx_rewriter_dune/foo_ppx_rewriter_dune.cmxs" {"ppx_rewriter_dune/foo_ppx_rewriter_dune.cmxs"}
    "_build/install/default/lib/foo/ppx_rewriter_dune/ppx.exe" {"ppx_rewriter_dune/ppx.exe"}
  ]
