This file is indexed.

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

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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-- Contributed by Conrad Steenberg http://code.google.com/p/crack-language/

Description="Crack"

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

Keywords={
  {  Id=1,
   List={"class", "for", "while", "in", "if", "else", "const",
         "oper", "return", "this", "abstract", "static", "enum",
         "import", "is", "try", "except", "throw", "bind", "release",
         "init", "del"
        }
  },
  { Id=2,
    List= { "bool", "byte", "byteptr", "void", "voidptr", "function", "array",
            "int", "uint", "int16", "uint16", "int32", "uint32", "int64", "uint64",
            "float", "float32", "float64", "intz", "uintz"
          }
  },
  { Id=3,
    Regex=[[@\w+]],
  },
  { Id=4,
    Regex=[[\@?(\w+)\s*[\(]|Exception|Object|String|VTableBase|Class|StaticString]]
  }
}

Strings = {
  Delimiter=[["|']],
  RawPrefix="r",
  Escape = [[ \\t|\\a|\\b|\\n|\\r|\\x[0-9a-fA-F]{2}|\\[0-7]{3} ]],
}

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

IgnoreCase=false

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

EnableIndentation=true