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-rw-r--r--lib/rdoc/markup/inline.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/markup/inline.rb b/lib/rdoc/markup/inline.rb
index fb3ab5c74d..58072fef06 100644
--- a/lib/rdoc/markup/inline.rb
+++ b/lib/rdoc/markup/inline.rb
@@ -1 +1,2 @@
+# frozen_string_literal: false
warn "requiring rdoc/markup/inline is deprecated and will be removed in RDoc 4." if $-w