[Issue 3960] Unused local variables not reported

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=3960
Issue 3960 depends on issue 7989, which changed state.

Issue 7989 Summary: isInputRange and isForwardRange declare unused variables
https://issues.dlang.org/show_bug.cgi?id=7989

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

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