("mirror://cran/src/contrib/My-Example_1.2.3.tar.gz"
"source")
(_ (error "Unexpected URL: " url))))))))
- (match ((@@ (guix import cran) description->package) description-alist)
+ (match ((@@ (guix import cran) description->package) 'cran description-alist)
(('package
('name "r-my-example")
('version "1.2.3")