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await
Combined from primary sources listed below.

In Channel§

See primary documentation in context for sub await 

multi await(Channel:D)
multi await(*@)

Waits until all of one or more Channels has a value available, and returns those values (it calls .receive on the Channel). Also works with Promises.

my $c = Channel.new;
Promise.in(1).then({$c.send(1)});
say await $c;

Since 6.d, it no longer blocks a thread while waiting.

In Promise§

See primary documentation in context for sub await 

multi await(Promise:D --> Promise)
multi await(*@ --> Array)

Waits until one or more promises are all fulfilled, and then returns their values. Also works on Channels. Any broken promises will rethrow their exceptions. If a list is passed it will return a list containing the results of awaiting each item in turn.