| 153 |      1 | 
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| 160 |      2 | //import scala.concurrent._
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|  |      3 | //import scala.concurrent.duration._
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|  |      4 | //import ExecutionContext.Implicits.global
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|  |      5 | //import scala.language.postfixOps 
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|  |      6 | //import scala.language.reflectiveCalls
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| 153 |      7 | 
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|  |      8 | 
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| 160 |      9 | //lazy val f = Future {
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| 153 |     10 |   import CW8a._
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|  |     11 | 
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|  |     12 |   assert(der('a', ZERO | ONE) == (ZERO | ZERO))
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|  |     13 |   assert(der('a', (CHAR('a') | ONE) ~ CHAR('a')) == ALT((ONE | ZERO) ~ CHAR('a'), ONE))
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|  |     14 |   assert(der('a', STAR(CHAR('a'))) == (ONE ~ STAR(CHAR('a'))))
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|  |     15 |   assert(der('b', STAR(CHAR('a'))) == (ZERO ~ STAR(CHAR('a'))))
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| 160 |     16 | //}
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| 153 |     17 | 
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| 160 |     18 | //Await.result(f, 120 second)
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