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object Test extends scala.util.parsing.combinator.RegexParsers {
val keywords = Set("if", "false")
def word: Parser[String] = "\\w+".r
def keyword: Parser[String] = word filter (keywords.contains)
def ident: Parser[String] = word filter(!keywords.contains(_))
def test = keyword ~ ident
def main(args: Array[String]) {
println(parseAll(test, "if false"))
println(parseAll(test, "not true"))
println(parseAll(test, "if true"))
}
}
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