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-rw-r--r--lib/rubygems/resolver/source_set.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/rubygems/resolver/source_set.rb b/lib/rubygems/resolver/source_set.rb
index bf8c23184e..296cf41078 100644
--- a/lib/rubygems/resolver/source_set.rb
+++ b/lib/rubygems/resolver/source_set.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
##
# The SourceSet chooses the best available method to query a remote index.
#