https://issues.dlang.org/show_bug.cgi?id=21532

          Issue ID: 21532
           Summary: dtoh: Forward-referencing issues for type aliases and
                    templates
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: kinke@gmx.net

In current frontend.h, we have methods using the `d_uns64` type alias before the corresponding `typedef`. The common `struct Array` template is also used before being declared (a fwd declaration might suffice, but there isn't any either).

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