/etc/emacs/site-start.d/50haskell-mode.el is in haskell-mode 2.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; /etc/emacs/site-start.d/50haskell-mode.el
;;
(debian-pkg-add-load-path-item "/usr/share/emacs/site-lisp/haskell-mode")
(load "haskell-site-file")
(setq interpreter-mode-alist
(append interpreter-mode-alist
'(("^#!.*runhugs" . haskell-mode)
("^#!.*runghc" . haskell-mode)
("^#!.*runhaskell" . haskell-mode))))
(add-hook 'haskell-mode-hook 'turn-on-font-lock)
(add-hook 'haskell-mode-hook 'turn-on-haskell-decl-scan)
(if (not (string-match "Lucid\\|XEmacs" emacs-version))
(add-hook 'haskell-mode-hook 'turn-on-haskell-doc-mode))
(add-hook 'haskell-mode-hook 'turn-on-haskell-indentation)
;(add-hook 'haskell-mode-hook 'turn-on-haskell-indent)
;(add-hook 'haskell-mode-hook 'turn-on-haskell-simple-indent)
;(add-hook 'haskell-mode-hook 'turn-on-haskell-hugs)
;(add-hook 'haskell-mode-hook 'turn-on-haskell-ghci)
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