GPathResult breakage in Groovy 5

[Mattias Reichel]

When trying out Groovy 5 on the Grails codebase I am getting the following
runtime error:

groovy.lang.MissingFieldException: No such field: id for class:
groovy.xml.slurpersupport.NodeChild
    at
org.grails.databinding.xml.GPathResultMap.<init>(GPathResultMap.groovy:35)
    at org.grails.databinding.xml.GPathResultMapSpec.Test nested
elements(GPathResultMapSpec.groovy:44)

class GPathResultMap implements Map {
    protected GPathResult gpath
    protected id

    GPathResultMap(GPathResult gpath) {
        this.gpath = gpath
        this.@id = gpa...@id.text() ?: null // <-- This is the offending line
    }

There is no id attribute on the GPathResult root:

<person>
   <name>John Doe</name>
   <locations>
      <location>
         <shippingAddress>foo</shippingAddress>
         <billingAddress>bar</billingAddress>
      </location>
      <location>
         <shippingAddress>foo2</shippingAddress>
         <billingAddress>bar2</billingAddress>
      </location>
   </locations>
</person>


Is this expected behavior, and we need to update our logic, or is it an
issue that needs addressing in Groovy?

Thanks
Mattias