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-rw-r--r--lib/rubygems/source_list.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems/source_list.rb b/lib/rubygems/source_list.rb
index e01f11cc1e..add82f2327 100644
--- a/lib/rubygems/source_list.rb
+++ b/lib/rubygems/source_list.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'rubygems/source'
##