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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract_adapter.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 42ed9ce82d..79aafc956f 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -162,7 +162,7 @@ module ActiveRecord
# this method must only be called while holding connection pool's mutex
def lease
if in_use?
- msg = "Cannot lease connection, ".dup
+ msg = +"Cannot lease connection, "
if @owner == Thread.current
msg << "it is already leased by the current thread."
else