Bundler displays a duplicate gem entries warning even if gems only appear once per group

lib/bundler/dsl.rb

@@ -128,7 +128,7 @@ def gem(name, *args)
         else
           Bundler.ui.warn "Your Gemfile lists the gem #{current.name} (#{current.requirement}) more than once.\n" \
                           "You should probably keep only one of them.\n" \
-                          "Remove any duplicate entries and specify the gem only once (per group).\n" \
+                          "Remove any duplicate entries and specify the gem only once.\n" \
                           "While it's not a problem now, it could cause errors if you change the version of one of them later."
         end
 

spec/commands/install_spec.rb

@@ -330,7 +330,7 @@
         G
 
         expect(err).to include("Your Gemfile lists the gem rack (>= 0) more than once.")
-        expect(err).to include("Remove any duplicate entries and specify the gem only once (per group).")
+        expect(err).to include("Remove any duplicate entries and specify the gem only once.")
         expect(err).to include("While it's not a problem now, it could cause errors if you change the version of one of them later.")
       end
 
@@ -342,7 +342,7 @@
         G
 
         expect(err).to include("Your Gemfile lists the gem rack (= 1.0) more than once.")
-        expect(err).to include("Remove any duplicate entries and specify the gem only once (per group).")
+        expect(err).to include("Remove any duplicate entries and specify the gem only once.")
         expect(err).to include("While it's not a problem now, it could cause errors if you change the version of one of them later.")
       end
     end