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/usr/share/highlight/langDefs/lhs.lang is in highlight-common 3.9-1+deb7u1.

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-- FIXME omitted definition of $INCLUDE
-- Language definition generated by lang2to3

dofile(HL_LANG_DIR.."haskell.lang")

Description="Haskell LHS"

Comments={
  { Block=false,
    Delimiter= { [[^\s*([^\>].*)]] },
  },
}