in reply to Re^2: Dereferencing undef as an array: Bug or WAD?
in thread Dereferencing undef as an array: Bug or WAD?
It does persist—you've autovivified $r as a reference to an array, but that array is still empty:
% perl -Mstrict -wle 'my $r = undef; map ++$_, @$r; print $r;' ARRAY(0x10116180)
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