Go through the gymnastics of making either value or pattern settable with synchronization to the other form. A derived value cannot be serialized and we want to serialize the pattern. When recreating the object we need to recreate it from the pattern string. The below sets both values if one is changed.
# File lib/puppet/pops/model/model.rb, line 35 def locator unless result = getLocator setLocator(result = Puppet::Pops::Parser::Locator.locator(source_text, source_ref(), line_offsets)) end result end