The CV structure used to represent coderefs internally in Perl's guts has slots for the sub's name and stash (package). This information is used by Carp when generating stack traces. Sub::Name uses some XS to poke some strings into those slots.

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

In reply to Re: how Sub::Name set anonymous subroutine 's caller to NOT __ANON__ ? by tobyink
in thread how Sub::Name set anonymous subroutine 's caller to NOT __ANON__ ? by chinaxing

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