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It was added in 51938c61f6f1b26e463f9071716f543543486e72, a commit with a 7,720 line diff and a one line commit message. Even then the comment was incorrect; there was a removed a `build_output_filenames` call with a `&[]` argument in rustdoc, but the commit removed that call. In such a large commit, it's easy for small errors to occur.