Most of those were only in core very briefly during development runs. attrs was the only one that had ever appeared in a stable release, and it had been deprecated for a very long time. (It was removed in Perl 5.11.0, but had been deprecated in Perl 5.6, around a decade earlier.)

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re^3: Should I list core modules as dependencies? by tobyink
in thread Should I list core modules as dependencies? by vsespb

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