expecting tASSOC in a Rails file - ruby-on-rails

Question

I'm sure I've done something stupid here, but I just can't see it.
I call the breadcrumb method in the application view.
app/helpers/breadcrumbs_helper.rb says:
module BreadcrumbsHelper
def breadcrumb
#crumb_list = []
drominay_crumb_builder
project_crumb_builder
content_tag(:div, :id => "breadcrumbs", #crumb_list.map { |list_item| crumb_builder(list_item) })
end
def crumb_builder(list_item)
if list_item == #crumb_list.last
content_tag(:span, list_item['body'], :class => list_item['crumb'])
else
body = ["list_item['body']", " → "].join
link_to(body, list_item['url'], :class => list_item['crumb'])
end
end
def drominay_crumb_builder
list_item = Hash.new
list_item['body'] = "Drominay"
list_item['url'] = "root"
#crumb_list << list_item
end
def project_crumb_builder
end
end
Why oh why am I getting this "expecting tASSOC" error? (And what is a tASSOC anyway?)
steven-nobles-imac-200:drominay steven$ script/server
=> Booting Mongrel (use 'script/server webrick' to force WEBrick)
=> Rails 2.2.2 application starting on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
Exiting
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require': /Users/steven/Drominay/app/helpers/breadcrumbs_helper.rb:7: syntax error, unexpected ')', expecting tASSOC (SyntaxError)
/Users/steven/Drominay/app/helpers/breadcrumbs_helper.rb:29: syntax error, unexpected $end, expecting kEND
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:153:in `require'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:521:in `new_constants_in'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:153:in `require'
from /Users/steven/Drominay/app/helpers/application_helper.rb:5
from /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:382:in `load_without_new_constant_marking'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:382:in `load_file'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:521:in `new_constants_in'
... 56 levels...
from /Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/commands/server.rb:49
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
from script/server:3

Answer 1

tASSOC means the => operator

Answer 2

It was because I had the arguments for content_tag in the wrong order.
Am still interested in knowing what a tASSOC is, however.