[Rails] removing instance variables in partials?

Hi,

I read some articles about why partials should not have instance
variables in them. But in "Ruby on Rails 3 Tutorial" the author starts
with this partial:

View:
<%= form_for(@user) do |f| %>
<%= render 'shared/error_messages' %>

Partial:
<% if @users.errors.any? %>
...
...

I thought removing the @user instance variable from the partial would
have involved doing this:

View:
<%= form_for(@user) do |f| %>
<%= render 'shared/error_messages', :user => @user %>

Partial:
<% if user.errors.any? %>

But the author actually does this:

View:
<%= form_for(@user) do |f| %>
<%= render 'shared/error_messages', :object => f.object %>

Partial:
<% if object.errors.any? %>

The author says that f.object is "the object corresponding to the form
variable f". Is that right? What's f then? Based on the way f.object
is used, it appears to be equivalent to @user. Is it?

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