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-rw-r--r--lib/weakref.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/weakref.rb b/lib/weakref.rb
index c6fe8cd..18b530f 100644
--- a/lib/weakref.rb
+++ b/lib/weakref.rb
@@ -40,7 +40,7 @@ class WeakRef<Delegator
ObjectSpace.call_finalizer orig
ObjectSpace.call_finalizer self
ID_MAP[@__id] = [] unless ID_MAP[@__id]
- ID_MAP[@__id].concat self.__id__
+ ID_MAP[@__id].push self.__id__
ID_REV_MAP[self.id] = @__id
end