/usr/share/lout/include/haskell is in lout-common 3.39-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#                                                                             #
#   Lout setup file for Haskell program printing                               #
#                                                                             #
#   Version 1.0                                                               #
#   Thorsten Seitz                                                            #
#   17 December 2001                                                          #
#                                                                             #
#   This file has been placed in the public domain by its author.             #
#                                                                             #
###############################################################################
###############################################################################
#                                                                             #
#  @SysInclude line                                                           #
#                                                                             #
#  This line causes Lout to read the definitions for this programming         #
#  language, and should not be touched.                                       #
#                                                                             #
###############################################################################
@SysInclude { haskellf }
###############################################################################
#                                                                             #
#  @Use clause                                                                #
#                                                                             #
#  To change the default value of any option, delete the # at the start of    #
#  its line and change the value between braces.                              #
#                                                                             #
###############################################################################
@Use { @HaskellSetup
  # pipe			{		} # pipe source through this
  # numbered			{ No		} # No, Yes, or a line number
  # numberedblanks		{ Yes		} # No or Yes
  # style	     { symbol @OrIfPlain fixed	} # fixed, varying, or symbol
  # the following options apply when style is "fixed"
  # fixedfont			{ Courier	} # font family
  # fixedsize			{ -1.0p		} # font size
  # fixedline			{ 1.0vx		} # line-space
  # fixedblanklinescale		{ 1.0		} # blank-line scale
  # fixedspace			{ lout		} # spacing mode
  # fixedtabin			{ 8		} # tab interval
  # fixedtabout			{ 8s		} # tab width
  # fixedidentifiers		{ Base		} # identifier face
  # fixedkeywords		{ Base		} # keyword face
  # fixedoperators		{ Base		} # operator face
  # fixednumbers		{ Base		} # number face
  # fixedstrings		{ Base		} # string face
  # fixedcomments		{ Base		} # comment face
  # fixedlinenumbers		{ Base		} # line numbers face
  # fixedidentifiersformat	{ @Body		} # identifiers format
  # fixedkeywordsformat		{ @Body		} # keywords format
  # fixedoperatorsformat	{ @Body		} # operators format
  # fixednumbersformat		{ @Body		} # numbers format
  # fixedstringsformat		{ @Body		} # strings format
  # fixedcommentsformat		{ @Body		} # comments format
  # fixedlinenumbersformat	{ @Body		} # line numbers format
  # the following options apply when style is "varying"
  # varyingfont			{		} # font family
  # varyingsize			{ 1.0f		} # font size
  # varyingline			{ 1.0vx		} # line-space
  # varyingblanklinescale	{ 1.0		} # blank-line scale
  # varyingspace		{ lout		} # spacing mode
  # varyingtabin		{ 8		} # tab interval
  # varyingtabout		{ 3f		} # tab width
  # varyingidentifiers		{ Slope		} # identifier face
  # varyingkeywords		{ Bold		} # keyword face
  # varyingoperators		{ Base		} # operator face
  # varyingnumbers		{ Base		} # number face
  # varyingstrings		{ Slope		} # string face
  # varyingcomments		{ Base		} # comment face
  # varyinglinenumbers		{ Base		} # line numbers face
  # varyingidentifiersformat	{ @Body		} # identifiers format
  # varyingkeywordsformat	{ @Body		} # keywords format
  # varyingoperatorsformat	{ @Body		} # operators format
  # varyingnumbersformat	{ @Body		} # numbers format
  # varyingstringsformat	{ @Body		} # strings format
  # varyingcommentsformat	{ @Body		} # comments format
  # varyinglinenumbersformat	{ @Body		} # line numbers format
  # the following options apply when style is "symbol"
  # symbolfont			{		} # font family
  # symbolsize			{ 1.0f		} # font size
  # symbolline			{ 1.0vx		} # line-space
  # symbolblanklinescale	{ 1.0		} # blank-line scale
  # symbolspace			{ lout		} # spacing mode
  # symboltabin			{ 8		} # tab interval
  # symboltabout		{ 3f		} # tab width
  # symbolidentifiers		{ Slope		} # identifier face
  # symbolkeywords		{ Bold		} # keyword face
  # symboloperators		{ Base		} # operator face
  # symbolnumbers		{ Base		} # number face
  # symbolstrings		{ Slope		} # string face
  # symbolcomments		{ Base		} # comment face
  # symbollinenumbers		{ Base		} # line numbers face
  # symbolidentifiersformat	{ @Body		} # identifiers format
  # symbolkeywordsformat	{ @Body		} # keywords format
  # symboloperatorsformat	{ @Body		} # operators format
  # symbolnumbersformat		{ @Body		} # numbers format
  # symbolstringsformat		{ @Body		} # strings format
  # symbolcommentsformat	{ @Body		} # comments format
  # symbollinenumbersformat	{ @Body		} # line numbers format
}
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