Why autovivification works at 'for'?

Question

I have next code:

print   for @{ $events->{ $name } };

When $events is empty hash I got $name key which value is empty array []

Why autovivification works despite on that I just access element and assign nothing to it?

Answer 1

Assigning doesn't autovivify; evaluating as an lvalue so that you can assign does.

Foreach's list expression is evaluated as an lvalue to allow $_ = 1 for @a;