https://issues.dlang.org/show_bug.cgi?id=23995

          Issue ID: 23995
           Summary: Cannot declare out parameter of opaque type
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: dkorpel@live.nl

Same as Issue 21668, but for `out` instead of `ref`

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