This file is indexed.

/etc/emacs/site-start.d/50noweb.el is in noweb 2.11b-7.1ubuntu1.

This file is owned by root:root, with mode 0o644.

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;-*-emacs-lisp-*-

;; Just assign the noweb major mode to .nw files

(autoload 'noweb-mode "/usr/share/emacs/site-lisp/noweb-mode.el"
  "Minor (meta) mode for editing noweb sources." t)

(or (assoc "\\.nw$" auto-mode-alist)
    (setq auto-mode-alist (cons '("\\.nw$" . noweb-mode)
				auto-mode-alist)))