* guix/packages.scm (input-graft, input-cross-graft): Store the monadic value
of the replacement in the 'replacement' field of <graft> instead of unwrapping
it.
(cumulative-grafts): Turn monadic values in the 'replacement' field of
applicable grafts into derivations.
* tests/packages.scm ("package-grafts, indirect grafts")
("package-grafts, indirect grafts, propagated inputs")
("package-grafts, same replacement twice")
("package-grafts, dependency on several outputs")
("replacement also grafted"): Do not compare <graft> records directly,
compare the relevant fields instead, calling ‘run-with-store’ on the
‘replacement’ field.
Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Change-Id: Idded0a402b8974df1ef2354f1a88c308b9b99777