[Issue 7517] Interface contracts broken

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=7517
Issue 7517 depends on issue 15984, which changed state.

Issue 15984 Summary: [REG2.071] Interface contracts retrieve garbage instead of parameters
https://issues.dlang.org/show_bug.cgi?id=15984

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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