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/usr/share/highlight/langDefs/diff.lang is in highlight-common 3.9-1build1.

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

Description="Diff"

Digits=[[ ^[\d,]*[ac]\d* ]]

Keywords={
  { Id=1,
    Regex=[[^[+<].*]],
  },
  { Id=2,
    Regex=[[^[->].*]],
  },
  { Id=3,
    Regex=[[^\.$]],
  },
  { Id=4,
    Regex=[[^@@.*@@$]],
  },
}

Comments={
  { Block=false,
    Delimiter= { [[regex(^\-\-\-$)]] },
  },
}