local our @o;
is the same as
our @o;
local @o;

our @o; disables use strict for @o.
local @o; protects the existing value of @o (and initialized @o to an empty array).

Without the local, there's no scoping. That's bad! If the caller also uses @o, you just clobbered the caller's variable.

In reply to Re^5: Multiple uses of (?{ code }) do not appear to be called by ikegami
in thread Multiple uses of (?{ code }) do not appear to be called by bsdz

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