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use Mojo::Base -strict, -signatures;
use Mojo::IOLoop;
...
    }
});
Mojo::IOLoop->start;

0s Loop PID is 8353
0s Start of loop 0
...
4s End of loop 1
4s Subprocess error: Can't locate object method "Return value of 0" vi
+a package "Mojo::IOLoop::Subprocess" at /opt/perl5.28/lib/site_perl/5
+.28.1/Mojo/IOLoop/Subprocess.pm line 53.
4s Subprocess error: Can't locate object method "Return value of 1" vi
+a package "Mojo::IOLoop::Subprocess" at /opt/perl5.28/lib/site_perl/5
+.28.1/Mojo/IOLoop/Subprocess.pm line 53.

0s Loop PID is 8462
0s Start of loop 0
...
2s Good bye, from PID 8464!
2s Result from loop 0: Return value of 0
2s Result from loop 1: Return value of 1