Spurious warning when used in unit function

[ewiner]

On Scala 2.11, async 0.9.1, this code works fine but produces a compiler warning:

a pure expression does nothing in statement position; you may be omitting necessary parentheses
await(Future{println("hello")})
     ^

import scala.async.Async._
import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global
import scala.util.Random

object AsyncTest {

  def randBool = (new Random).nextBoolean()

  def doStuffWithSideEffect(): String = {
    println("goodbye")
    "foo"
  }

  def test() {
    async {
      if (randBool) {
        await(Future{println("hello")})
        doStuffWithSideEffect()
      }
    }
  }

}

Unless I'm mistaken, this warning shouldn't be there - that is, it doesn't appear if you write a synchronous function with a similar pattern.

[ljwagerfield]

+1

[okalex]

+1

[jvoorhis]

+1

[stephenjudkins]

+1