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This is because of a change in Perl 5.14:

Filehandle method calls load IO::File on demand

The OP's code does work in Perl 5.10, if you run it with the -MIO::Handle parameter to manually load the IO::Handle package.

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

In reply to Re^2: Unexpected behavior of function 'say' by tobyink
in thread Unexpected behavior of function 'say' by farang

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