/usr/share/source-highlight/haskell_literate.lang is in libsource-highlight-common 3.1.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # Haskel literate programming
# both Bird and Latex style
state code start '^>' begin
include "haskell.lang"
end
state code delim "\\begin{code}" "\\end{code}" multiline begin
include "haskell.lang"
end
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