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Add test showing scala/bug#3212 is fixed

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	`1`	`+package scala.util.parsing.combinator`
	`2`	`+`
	`3`	`+import org.junit.Test`
	`4`	`+import org.junit.Assert.assertEquals`
	`5`	`+`
	`6`	`+class t3212 extends RegexParsers {`
	`7`	`+`
	`8`	`+ sealed trait BuySell`
	`9`	`+ case object BUY extends BuySell`
	`10`	`+ case object SELL extends BuySell`
	`11`	`+`
	`12`	`+ def buy_sell: Parser[BuySell] =`
	`13`	`+ "to" ~> "buy" ^^^ BUY \|`
	`14`	`+ "to" ~> "sell" ^^^ SELL \|`
	`15`	`+ failure("buy or sell expected")`
	`16`	`+`
	`17`	`+ @Test`
	`18`	`+ def test: Unit = {`
	`19`	`+ val parseResult = parse[BuySell](phrase(buy_sell), "bought")`
	`20`	`+`
	`21`	`+ val expected = """[1.1] failure: buy or sell expected`
	`22`	`+`
	`23`	`+bought`
	`24`	`+^"""`
	`25`	`+ assertEquals(expected, parseResult.toString)`
	`26`	`+ }`
	`27`	`+}`

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