[Issue 20079] New: [2.087.0] Forward declaration of functions defined in mixin templates don't compile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20079

          Issue ID: 20079
           Summary: [2.087.0] Forward declaration of functions defined in
                    mixin templates don't compile
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: gooberman at gmail.com

This is one of two issues that I believe have been harassing me all day, night,
and early morning with mixins.

Forward declare a function in an object. Mixin an implementation. Try to call
it. Unresolved symbol.

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