A simple workaround to avoid the following warning message:
~/.pdk/cache/ruby/2.1.0/gems/puppet-lint-legacy_facts-check-1.0.1/lib/puppet-lint/plugins/legacy_facts.rb:2: warning: already initialized constant VAR_TYPES
/opt/puppetlabs/pdk/share/cache/ruby/2.1.0/gems/puppet-lint-2.3.6/lib/puppet-lint/plugins/check_strings/only_variable_string.rb:6: warning: previous definition of VAR_TYPES was here
A simple workaround to avoid the following warning message: