zef install inline::perl5 hangs

[jdoege]

I am trying to install inline::perl5 on a MacOS High Sierra 10.13.4 machine running Rakudo Perl6 2018.1 and Perl 5.26.2 as the installed version of Perl 5 in my path. I also tried with the 5.18.2 version that comes with the OS and got the same results.
I am issuing the command zef install inline::perl5
When the testing phase gets to modify_array.t it hangs. Doing a bit of debugging, modify_array.t hangs on the
$array.splice: 0, 0, [1, 2, 3, 4]; statement on line 61.
I removed modify_array.t from the test suite and installation proceeds to a successful completion.