Issue with plain Task and do!

[Jérémie Laval]

Works:

let fooTask = FSharp.Control.Tasks.ContextSensitive.task

let someOp =
  fooTask {
    do! Task.Delay(4)
  }

Doesn't work:

let fooTask = FSharp.Control.Tasks.ContextInsensitive.task

let someOp =
  fooTask {
    do! Task.Delay(4)
  }

With the following errors:

error FS0001: The type 'Task' is not compatible with the type 'Task<'a>'
error FS0193: Type constraint mismatch. The type 'Task' is not compatible with type 'Task<unit>'

Basically the insensitive builder seem to not have the generic support for awaitable that's in the code

[Robert Peele]

It should work if you open FSharp.Control.Tasks.ContextInsensitive.

The generic awaitable is not defined on the builder class, but on an extension method exported by that module. So you must open the module to use generic awaitables; just bringing in builder object itself is not enough.