[Issue 17206] Checks that opEquals and toHash are both defined or neither are defined

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17206

Jack Stouffer <jack at jackstouffer.com> changed:

           What    |Removed                     |Added
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         Depends on|                            |18673


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=18673
[Issue 18673] std.socket.InternetAddress has opEquals but no toHash
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