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-rw-r--r--Library/Homebrew/extend/set.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/Library/Homebrew/extend/set.rb b/Library/Homebrew/extend/set.rb
index b45b85de9..e67a05792 100644
--- a/Library/Homebrew/extend/set.rb
+++ b/Library/Homebrew/extend/set.rb
@@ -20,5 +20,6 @@ class ComparableSet < Set
def merge enum
enum.is_a?(Enumerable) or raise ArgumentError, "value must be enumerable"
enum.each { |o| add(o) }
+ self
end
end