Puppet::Parser::Functions::newfunction( :with, :type => :rvalue, :arity => -1, :doc => <<-DOC Call a lambda code block with the given arguments. Since the parameters of the lambda are local to the lambda's scope, this can be used to create private sections of logic in a class so that the variables are not visible outside of the class. Example: # notices the array [1, 2, 'foo'] with(1, 2, 'foo') |$x, $y, $z| { notice [$x, $y, $z] } - since 3.7.0 - note requires future parser DOC ) do |args| function_fail(["with() is only available when parser/evaluator future is in effect"]) end