Using (select) with same named library and module give duplicates

[jonahbeckford]

Expected Behavior

When compiling ocaml-crunch.3.3.1 with a recent trunk commit of Dune, I expect to see ocaml-crunch compile successfully.

In particular https://github.com/mirage/ocaml-crunch/blob/bd4f0195b35c602b8b83886bc8731e649b1e3f9c/src/dune should build:

(library
 ; Dummy library to detect the OCaml version
 (name realpath)
 (modules)
 (enabled_if
  (< %{ocaml_version} "4.13")))

(library
 (name crunch)
 (wrapped false)
 (synopsis "Compile static files into a static filesystem")
 (modules crunch)
 (public_name crunch)
 (libraries unix ptime)
 (flags :standard -safe-string))

(executable
 (name main)
 (modules main realpath)
 (public_name ocaml-crunch)
 (libraries
  cmdliner
  crunch
  (select
   realpath.ml
   from
   (realpath -> realpath.pre_413.ml)
   (-> realpath.unix.ml))))

(There is a smaller, minimal test case in the reproduction section)

Actual Behavior

Instead I see:

[crunch-4168-afad7d.out] File "src/dune", line 1, characters 0-0:
[crunch-4168-afad7d.out] Error: Module "Realpath" is used in several stanzas:
[crunch-4168-afad7d.out] - src/dune:1
[crunch-4168-afad7d.out] - src/dune:17
[crunch-4168-afad7d.out] To fix this error, you must specify an explicit "modules" field in every
[crunch-4168-afad7d.out] library, executable, and executables stanzas in this dune file. Note that
[crunch-4168-afad7d.out] each module cannot appear in more than one "modules" field - it must belong
[crunch-4168-afad7d.out] to a single library or executable.

Reproduction

• PR with a reproducing test:

#6725

Specifications

• Version of dune (output of dune --version):
  n/a (it is a trunk version a237caa)

• Version of ocaml (output of ocamlc --version)
  4.14.0

• Operating system (distribution and version):
  Windows 11 22H2 22621.963