anchor.diff:      /// invocation of `u2x` does not prevent scheduling of other work.
       val inline isolate: (unit -> 'x) -> Job<'x>
   
  -  //# Randomization
  -
     /// Operations on the built-in pseudo random number generator (PRNG) of Hopac.
   #if DOC
     ///
  
positive.code: #endif
    val abort: unit -> Job<_>
  
    //# Exception handling
  
    /// Creates a job that has the effect of raising the specified exception.
  
negative.code:   /// debugging purposes.  You can always break abstractions using reflection.
    /// See also: `Alt.paranoid`.
    val paranoid: Job<'x> -> Job<'x>
  
    /// Operations for dealing with the scheduler.
    module Scheduler =
  