woothemes/woocommerce — pull request #4429 by toddlahman (2013-12-29 13:14:26+00:00)
Title: Registration error handler and my_account_message hook

To block registration spam, and authenticate the $_POST values, a
woocommerce_process_registration_errors filter hook is needed.

WordPress has a login_message filter, which causes a duplicate message
on the My Account login page since WC uses the same filter hook name. A
different filter hook name, such as my_account_message, would eliminate
this issue.