https://issues.dlang.org/show_bug.cgi?id=22232

Adam D. Ruppe <destructionator@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |destructionator@gmail.com

--- Comment #1 from Adam D. Ruppe <destructionator@gmail.com> ---
This is by design, see item 13 here:
 https://dlang.org/spec/interface.html

Even if the parent already did the interface, the spec says the interface must be implemented again. You can do it by using forwarding functions.

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https://issues.dlang.org/show_bug.cgi?id=22232

Paul Backus <snarwin+bugzilla@gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |snarwin+bugzilla@gmail.com
         Resolution|---                         |INVALID

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