object iw extends Object {
    private[this] val res0: scala.runtime.BoxedUnit = _;
    <stable> <accessor> def res0(): Unit = ();
    final def apply$body$1(s: String): String = s.+(s);
    def <init>(): type = {
      iw.super.<init>();
      iw.this.res0 = {
        Test.test({
          new <$anon: java.util.function.Function>()
        });
        scala.runtime.BoxedUnit.UNIT
      };
      ()
    }
  };
  @SerialVersionUID(value = 0) final class anonfun$1 extends Object with java.util.function.Function with Serializable {
    final override <synthetic> def apply(s: String): String = $line3.iw.apply$body$1(s);
    final override <synthetic> <bridge> <artifact> def apply(x$1: Object): Object = anonfun$1.this.apply(x$1.$asInstanceOf[String]());
    def <init>(): <$anon: java.util.function.Function> = {
      anonfun$1.super.<init>();
      ()
    }
  }

scala> () => Test.test(s => s + s)
res0: () => Unit = <function0>

scala> res0()
Splitting from [0 5)
Could not split [0 3)
Could not split [3 5)
Trying at 3 [3, 5)
Trying at 0 [0, 3)
Trying at 1 [0, 3)
Trying at 4 [3, 5)
Trying at 2 [0, 3)
Trying at 5 [3, 5)
Trying at 3 [0, 3)
Optional[twotwo]

import scala.concurrent._
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext.Implicits.global

// This works fine:
val x = Future(42)
Await.result(x, 1.second)

// This throws a TimeoutException:
Await.result(Future(42), 1.second)

[tut] compiling: /Users/dave/dev/projects/advanced-scala/src/pages/test.md
java.lang.NoClassDefFoundError: Could not initialize class $line4.$read$$iw$$iw$$iw$$iw$$iw$$iw$
    at scala.runtime.java8.JFunction0$mcI$sp.apply(JFunction0$mcI$sp.java:12)
    at scala.concurrent.Future$.$anonfun$apply$1(Future.scala:653)
    at scala.util.Success.$anonfun$map$1(Try.scala:251)
    at scala.util.Success.map(Try.scala:209)
    at scala.concurrent.Future.$anonfun$map$1(Future.scala:287)
    ... manually elided for brevity
[tut] *** Error reported at /Users/dave/dev/projects/advanced-scala/src/pages/monads/test.md:6
java.util.concurrent.TimeoutException: Futures timed out after [1 second]
  at scala.concurrent.impl.Promise$DefaultPromise.ready(Promise.scala:255)
  at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:259)
  at scala.concurrent.Await$.$anonfun$result$1(package.scala:190)
  at scala.concurrent.BlockContext$DefaultBlockContext$.blockOn(BlockContext.scala:53)
  at scala.concurrent.Await$.result(package.scala:123)
  ... 88 elided
[error] (run-main-0) java.lang.Exception: Tut execution failed.
[trace] Stack trace suppressed: run last *:streams for the full output.
[trace] Stack trace suppressed: run last *:tutOnly for the full output.
[error] (*:tutOnly) Nonzero exit code: 1
[error] Total time: 5 s, completed 27-Feb-2017 09:38:19