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-rw-r--r--lib/rubygems/package/io_source.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems/package/io_source.rb b/lib/rubygems/package/io_source.rb
index f89593dd2d..16a6e4be8b 100644
--- a/lib/rubygems/package/io_source.rb
+++ b/lib/rubygems/package/io_source.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# Supports reading and writing gems from/to a generic IO object. This is
# useful for other applications built on top of rubygems, such as