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/usr/share/highlight/langDefs/qu.lang is in highlight-common 3.8-2.

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

The actual contents of the file can be viewed below.

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-- FIXME omitted definition of $KEYWORDS(KWC)
-- Language definition generated by lang2to3

Description="Qu"

Keywords={
  { Id=1,
    List={"abstract", "as", "atomic", "break", "case", "catch", "class", "const", "continue", "default", "do", "each", "elif", "else", "end", "enum", "ensure", "final", "finally", "for", "if", "in", "is", "lambda", "local", "loop", "me", "nil", "once", "pass", "public", "redo", "return", "self", "static", "struct", "sub", "super", "switch", "throw", "true", "try", "until", "use", "var", "while", "xor", "yield", "alias", "private", "import", "of", "on", "to", "from", "swap", "unless"},
  },
  { Id=2,
    List={"bool", "char", "string", "vector", "map", "set", "null", "error", "new"},
  },
  { Id=3,
    List={"or", "and", "not"},
  },
  { Id=4,
    Regex=[[__\w+]],
  },
}

Strings={
  Delimiter=[["|'|`|```]],
}

IgnoreCase=false

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

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

--FIXME no default escchar param: regex(\\\d{3}|\\x\p{XDigit}{2}|\\[ntvbrfa\\\?'"])