[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
----------------------------------------------------------------------------
         Depends on|                            |18674, 18675, 18676, 18677,
                   |                            |18678


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=18674
[Issue 18674] std.json.JSONValue has opEquals but no toHash
https://issues.dlang.org/show_bug.cgi?id=18675
[Issue 18675] std.experimental.checkedint.Checked has opEquals but no toHash
https://issues.dlang.org/show_bug.cgi?id=18676
[Issue 18676] std.datetime.date.DateTime has opEquals but no toHash
https://issues.dlang.org/show_bug.cgi?id=18677
[Issue 18677] std.datetime.date.Date has opCmp but no toHash
https://issues.dlang.org/show_bug.cgi?id=18678
[Issue 18678] std.datetime.date.TimeOfDay has opCmp but no toHash
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