issue with custom types and providers

[Matt]

So I'm trying to follow the example in the Pro Puppet book and I'm running into the issue where "resource" variable is not defined. Looking at the code for packages, I did something similar but it doesnt work either. 

    newparam(:type) do
      desc "Deprecated form of `provider`."

      munge do |value|
        warning "'type' is deprecated; use 'provider' instead"
        @resource[:provider] = value

        @resource[:provider]
      end
    end

Here is the error I am getting.
info: Retrieving plugin
notice: /File[/var/lib/puppet/lib/puppet/type/repo.rb]/content: content changed '{md5}ed4323af3135341a4c1510a2a1b06ba7' to '{md5}f383a20a73846a4f1d96002c628e4b17'
info: Loading downloaded plugin /var/lib/puppet/lib/puppet/type/repo.rb
err: Could not load downloaded file /var/lib/puppet/lib/puppet/type/repo.rb: undefined local variable or method `resource' for Puppet::Type::Repo::Provider:Class
info: Redefining repo in Puppet::Type
err: Could not retrieve catalog from remote server: Could not intern from pson: Could not autoload repo: undefined local variable or method `resource' for Puppet::Type::Repo::Provider:Class

Here is my code so far.
Puppet::Type.newtype(:repo) do
        @doc = "Manage repositories"
        ensurable
        newparam(:name) do
                desc "Name"
                isnamevar
        end
        newproperty(:provider) do
                resource[:provider] = :gem
        end
        newparam(:url) do
                desc "Url for repo"
        end
        newparam(:enable) do
                desc "Whether repo is enabled or not"
        end
end

[Matt]

This is with puppet 2.6 and one minor difference was in my code I tried both newparam and newproperty to see if it was potentially just a simple mistake.