async_reflect: Make an asynchronous function that always succeeds
Description
This is sometimes useful, if the function is applied to entries in
a vector or list.
Usage
async_reflect(task)
Arguments
task
Function to transform.
Value
Async function returning a deferred value that is never
rejected. Instead its value is a list with entries error and
result. If the original deferred was resolved, then error is
NULL. If the original deferred was rejected, then result is
NULL.