Merge pull request #2283 from dotty-staging/test-deadlock

Add test from typelevel/scalacheck#290

Author: DarkDimius

tests/run/deadlock.check

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+1

tests/run/deadlock.scala

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+// from https://github.com/rickynils/scalacheck/issues/290
+import scala.concurrent._
+import scala.concurrent.duration._
+import java.util.concurrent.Executors
+
+object Test {
+  import ExecutionContext.Implicits.global
+  val x = Await.result(Future(1), 1000.seconds)
+  def main(args: Array[String]) = println(x)
+}
+