weather: Don't look for exported package replacements twice.

* guix/scripts/weather.scm (all-packages): Delete duplicates, so that exported
replacements aren't included twice.

1 files changed, 12 insertions, 10 deletions

diff --git a/guix/scripts/weather.scm b/guix/scripts/weather.scm
index 06312d65a2..60a697d1ac 100644
--- a/guix/scripts/weather.scm
+++ b/guix/scripts/weather.scm
@@ -54,16 +54,18 @@
 
 (define (all-packages)
   "Return the list of public packages we are going to query."
-  (fold-packages (lambda (package result)
-                   (match (package-replacement package)
-                     ((? package? replacement)
-                      (cons* replacement package result))
-                     (#f
-                      (cons package result))))
-                 '()
-
-                 ;; Dismiss deprecated packages but keep hidden packages.
-                 #:select? (negate package-superseded)))
+  (delete-duplicates
+   (fold-packages (lambda (package result)
+                    (match (package-replacement package)
+                      ((? package? replacement)
+                       (cons* replacement package result))
+                      (#f
+                       (cons package result))))
+                  '()
+
+                  ;; Dismiss deprecated packages but keep hidden packages.
+                  #:select? (negate package-superseded))
+   eq?))
 
 (define (call-with-progress-reporter reporter proc)
   "This is a variant of 'call-with-progress-reporter' that works with monadic