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/usr/share/highlight/langDefs/limbo.lang is in highlight-common 3.41-1.

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Description="Limbo"

Keywords={
  {  Id=1,
   List={ "if", "else", "while", "do", "return", "list", "of", 
          "ref", "load", "import", "include"}
  },

  { Id=2,
    List= { "byte","int","big","real", "string" , "array"}
  },
  { Id=3,
    Regex=[[(\w+)\s*\:]]
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

Strings = {
  Delimiter=[["]]
}

Comments = {
   {
     Block=false,
     Delimiter = { [[#]] }
   }
}

IgnoreCase=false

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\.|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-|\~|\|]]