bug#71979: (file-name->module-name (location-file (package-location pkg))) returns wrong module

[Tomas Volf]

Hi,

when I try to use the above, it returns wrong module.  The module returned is
prefixed by #{.}# symbol.  Full reproducer:

    (define-module (xx)
      #:use-module (guix)
      #:use-module (guix modules)
      #:use-module (guix utils))

    (define-public pkg
      (package
        (name "foo")
        (version #f)
        (source #f)
        (build-system #f)
        (synopsis #f)
        (description #f)
        (license #f)
        (home-page #f)))

    (pk (file-name->module-name (location-file (package-location pkg))))

Now just run it:

    $ GUILE_AUTO_COMPILE=0 guile -L . -c '(use-modules (xx))'

    ;;; ((#{.}# xx))

Notice that the module is not just (xx) as it should have been.

The impact of this bug is broken guix pull for my channel (I will work around it
somehow, I hope) but still it would be nice if it worked properly, hence this 
report.

Have a nice day,
Tomas Volf

--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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