validate_legacy.rb
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	Puppet::Functions.create_function(:validate_legacy) do
	# The function checks a value against both the target_type (new) and the previous_validation function (old).

	dispatch :validate_legacy do
	param 'Any', :scope
	param 'Type', :target_type
	param 'String', :function_name
	param 'Any', :value
	repeated_param 'Any', :args
	end

	dispatch :validate_legacy_s do
	param 'Any', :scope
	param 'String', :type_string
	param 'String', :function_name
	param 'Any', :value
	repeated_param 'Any', :args
	end

	# Workaround PUP-4438 (fixed: https://github.com/puppetlabs/puppet/commit/e01c4dc924cd963ff6630008a5200fc6a2023b08#diff-c937cc584953271bb3d3b3c2cb141790R221) to support puppet < 4.1.0 and puppet < 3.8.1.
	def call(scope, *args)
	manipulated_args = [scope] + args
	self.class.dispatcher.dispatch(self, scope, manipulated_args)
	end

	def validate_legacy_s(scope, type_string, *args)
	t = Puppet::Pops::Types::TypeParser.new.parse(type_string, scope)
	validate_legacy(scope, t, *args)
	end

	def validate_legacy(scope, target_type, function_name, value, *prev_args)
	if assert_type(target_type, value)
	if previous_validation(scope, function_name, value, *prev_args)
	# Silently passes
	else
	Puppet.notice("Accepting previously invalid value for target type '#{target_type}'")
	end
	else
	inferred_type = Puppet::Pops::Types::TypeCalculator.infer_set(value)
	error_msg = Puppet::Pops::Types::TypeMismatchDescriber.new.describe_mismatch("validate_legacy(#{function_name})", target_type, inferred_type)
	if previous_validation(scope, function_name, value, *prev_args)
	call_function('deprecation', 'validate_legacy', error_msg)
	else
	call_function('fail', error_msg)
	end
	end
	end

	def previous_validation(scope, function_name, value, *prev_args)
	# Call the previous validation function and catch any errors. Return true if no errors are thrown.
	begin
	scope.send("function_#{function_name}".to_s, [value, *prev_args])
	true
	rescue Puppet::ParseError
	false
	end
	end

	def assert_type(type, value)
	Puppet::Pops::Types::TypeCalculator.instance?(type, value)
	end
	end

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