do/while crasher

[retronym]

import scala.concurrent._, ExecutionContext.Implicits.global
    def Foo(f: () => Boolean, g: () => Future[Boolean]): Future[Boolean] = async {
      var b = false
      do {
        b = await {
          g()
        }
      } while (b && !f())
      b
    }

scala: Unknown label target: method doWhile$1 at: source-/Users/jason/code/scala-async/src/test/scala/scala/async/run/t48.scala,line-37,offset=947: ctx: package run { class scala.async.run.t48$stateMachine$1$1 { def scala.async.run.t48$stateMachine$1$1.resume { bb=15 } } }
scala: uncaught exception during compilation: scala.reflect.internal.FatalError

[retronym]

Minimized:

import scala.async.internal.AsyncId._     
async {                                   
  val b = false                           
  do {                                    
    await(())                             
  } while (b)                             
  ()                                      
}                                         

[retronym]

Also:

while(await{...}){...}