[perl #125653] A promise returned by Proc::Async.start will never be kept or broken if the process is killed by the current process

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# New Ticket Created by  Rob Hoelz 
# Please include the string:  [perl #125653]
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See the attached script.
use v6;

my $proc = Proc::Async.new('sleep', '5');
my $p = $proc.start;
$proc.kill;
await $p;