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

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Description="Pony"

--Digits = [[ (?:0x|0X|0b)[0-9a-fA-F']+|\d*[\.]?\d+(?:[eE][\-\+]\d+)?[lLuU]* ]]

Keywords={
  {  Id=1,
    List={ "actor", "as", "be", "box", "break", "class", "compile_error", "continue", "consume", "do", "else", "elseif", "embed", 
            "end", "error", "for", "fun", "if", "ifdef", "in", "interface", "is", "iso", "lambda", "let", "match", "new", "object",
            "primitive", "recover", "ref", "repeat", "return", "tag", "then", "this", "trait", "trn", "try", "type", "until", "use", 
            "var", "val", "where", "while", "with"}
  },
  { Id=2,
    List= { "Bool", "ISize", "ILong", "I8", "I16", "I32", "I64", "I128", "USize", "ULong", "U8", "U16", "U32", "U64", "U128", "F32", "F64", 
            "String", "true", "false"}
  },
  { Id=3,
    Regex=[[\w+']]
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

Strings={
  Delimiter=[["""|"]],
 -- RawPrefix="r",
 -- Escape=[=[\\[ntvbrfa\\\?'"]|\\\d{3}|\\x[[:xdigit:]]{2}]=],
 -- Interpolation=[[ %[%#0\-\+\ diouxXeEfFgGcrs]+|%\(\w+\)[sd]? ]]
}

Comments = {
   { Block=true,
     Nested=true,
     Delimiter = { [[\/\*]], [[\*\/]] }
   },
   {
     Block=false,
     Delimiter = { [[//]] }
   }
}

IgnoreCase=false

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

EnableIndentation=false