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-rw-r--r--lib/gitlab/diff/line_mapper.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/gitlab/diff/line_mapper.rb b/lib/gitlab/diff/line_mapper.rb
index cf71d47df8e..fba7bff4781 100644
--- a/lib/gitlab/diff/line_mapper.rb
+++ b/lib/gitlab/diff/line_mapper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
# When provided a diff for a specific file, maps old line numbers to new line
# numbers and back, to find out where a specific line in a file was moved by the
# changes.