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The promise callback chain won't start until L</condvar> or L</fulfill> is
called on the instance. Calling L</condvar> or L</cv> will start the callback
chain and return the promise guarding condvar, which is fulfilled after the last
callback on the chain returns. Similarily, L</fulfill> will start the chain, but
will block until the guarding condvar is fulfilled.

Errors in the callbacks can be caught by setting an exception handler via the
L</catch> method on the promise instance. This method will catch exceptions
raised from L<AnyEvent> objects and exceptions raised in blocks provided to
L</then>. If an error is encountered in the chain, an exception will be thrown
and the rest of the chain will be skipped, jumping straight to the catch
callback.

=head1 EXPORT

=head2 promise($cb)

Start promise chain with callback C<$cb>. This function is a shortcut to
L<AnyEvent::Promise::new|/new>, and returns a promise object with the callback
attached.