* guix/gexp.scm (lower-reference-graphs)[tuple->gexp-input]: Add ‘gexp-input?’ case. (gexp->derivation): Update docstring. * doc/guix.texi (G-Expressions): Adjust accordingly. * tests/gexp.scm ("references-file, non-default output"): New test. Reviewed-by: Maxim Cournoyer <maxim.cournoyer@gmail.com> Change-Id: I595cb75da0867ab8ab44552887dc06ed1d23315e