https://issues.dlang.org/show_bug.cgi?id=17686

          Issue ID: 17686
           Summary: Covariant return types doesn't work with override in
                    some cases
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: kozzi11@gmail.com

This works before dmd 2.075

https://run.dlang.io/is/0hoAtP

this affect std_experimental_xml dub package

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