/usr/share/lhs2tex-1.18.1/lambda.fmt is in lhs2tex 1.18.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% lambda.fmt
%
% Format \ x -> y as \ x . y in TeX
% Based on forall.fmt; look there for slightly more
% documentation.
%
% Andres Loeh, September 2008, version 1.1
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%endif
%if not lhs2tex_lambda_fmt_read
%let lhs2tex_lambda_fmt_read = True
%include lhs2TeX.fmt
%include forall.fmt
%
%if style /= newcode
%format \ = lambda_ "\hslambda "
%format -> = "\hsarrow{" `arrow_` "}{" lambdaperiod_ "}"
%format `arrow_` = "\rightarrow "
%format lambda_ = "\lambda "
%format lambdaperiod_ = "\mathpunct{.}"
%
\ReadOnlyOnce{lambda.fmt}%
\makeatletter
\newcommand\hslambda{\global\let\hsarrow=\hsarrowperiodonce}
\newcommand*\hsarrowperiodonce[2]{#2\global\let\hsarrow=\hscompose}
\AtHaskellReset{\global\let\hsarrow=\hscompose}
% In the beginning, we should reset Haskell once.
\HaskellReset
\makeatother
\EndFmtInput
%endif
%endif
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