In B::Utils::parent I read that Simon is not sure how to find the parent of nodes where ->seq is false. When does this happen?

sub B::OP::parent {
    my $target = shift;
    die "I'm not sure how to do this yet. I'm sure there is a way. If 
+you know, please email me."
        if (!$target->seq);
    ...

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In reply to When is an opcode's ->seq empty? by diotalevi

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