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    $bool = $async->is_error;
    $bool = $async->is_value;

Inspect the state of an Async (see L<"Async States"|/"ASYNC STATES">).

=head1 WHAT THIS MODULE IS NOT

This module is not very well tested and battle-proven.
There are certainly still some bugs lurking around.

This module does not provide first-class corountines or async/await keywords.
It is just a library.
Check out the L<Future::AsyncAwait|Future::AsyncAwait> module instead.

This module does not provide first-class Future objects.
While Asyncs are Future-like, you cannot resolve an Async explicitly.
Check out the L<Future|Future> module instead.

This module does not implement an event loop.
The C<run_until_completion()> function does run a dispatch loop,
but there is no concept of events, I/O, or timers.