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

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Description="Kotlin"

Keywords={
  {  Id=1,
   List={"package", "as", "typealias", "class", "this", "super", "val", "var", 
            "fun", "for", "null", "true", "false", "is", "in", "throw", "return", "break", 
            "continue", "object", "if", "try", "else", "while", "do", "when", "interface", 
            "yield", "typeof", "yield", "typeof", "import", "internal", "private", "protected", 
            "public", "override",  "open",  "final",  "abstract",  "final",  
            "enum",  "open",  "annotation"}
  },
  {  Id=2,
   List={"Any","Unit", "String", "Array", "Int", "Boolean", "Char", "Long", "Double",
         "Float", "Short", "Byte" }
  },
  { Id=3,
    Regex=[[@\w+]]
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

Strings = {
  Delimiter=[['|`|"]],
    Interpolation=[[ [%$]\w+|\$\{.+?\} ]],
}

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

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