[Issue 7431] overload resolution should be more fine-grained

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=7431

timon.gehr at gmx.ch changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

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