Bug in package title

# This doesn't work.  I expected to install Package['util-master'], etc.
# but instead I get the error:
# Puppet::Parser::AST::Resource failed with error ArgumentError: Cannot alias Package[content] to ["jobs::install-master"] at /Users/pburkholder/.tmp/site_clean.pp:34; resource ["Package", "jobs::install-master"] already defined at /Users/pburkholder/.tmp/site_clean.pp:34 at /Users/pburkholder/.tmp/site_clean.pp:34 on node peters-macbook-pro.local
# Note that 'jobs::install' is the title of the class, not the title of the
# package resource being declared.


node default {
  include jobs
}

class jobs {
        include jobs::params, jobs::install

        Class["jobs::params"] -> Class["jobs::install"]
}

class jobs::params {
    $package_version='latest'
    $package_branch='master'
    $package_list=[ "mail", "content", "keyword", "classifierpy", "util", ]
}

class jobs::install {
    # Install the whole list
    package { $jobs::params::package_list:
        name    => "${title}-${jobs::params::package_branch}",
        ensure => $jobs::params::package_version
    }
}