Remove definition of function that can be replaced by (map specification->package ...)

config.scm

@@ -1,18 +1,12 @@
 (use-modules
  (gnu)
+ (gnu packages)
  (gnu packages shells)
  (guix profiles)
  (guix packages)
  (srfi srfi-1))
 (use-service-modules desktop docker networking ssh xorg)
 
-(define (manifest->packages manifest)
-  "Return the list of packages in MANIFEST."
-  (filter-map (lambda (entry)
-                (let ((item (manifest-entry-item entry)))
-                  (if (package? item) item #f)))
-              (manifest-entries manifest)))
-
 (operating-system
   (locale "en_CA.utf8")
   (timezone "America/Toronto")
@@ -53,8 +47,7 @@
 
   (packages
    (append
-      (manifest->packages
+    (map specification->package
-        (specifications->manifest
      '("docker"
        "docker-cli"
        "docker-compose"
@@ -70,7 +63,7 @@
        "tmux"
        "xterm"
        "xrandr"
-	    "xsetroot")))
+       "xsetroot"))
     %base-packages))
 
   (services (cons* (service docker-service-type)