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-rw-r--r--lib/set.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/set.rb b/lib/set.rb
index 9908aa6458..a0f290ebed 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -151,7 +151,7 @@ class Set
@hash.replace(enum.instance_variable_get(:@hash))
self
else
- do_with_enum(enum)
+ do_with_enum(enum) # make sure enum is enumerable before calling clear
clear
merge(enum)
end