[Issue 18675] std.experimental.checkedint.Checked has opEquals but no toHash

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18675

--- Comment #2 from Jack Stouffer <jack at jackstouffer.com> ---
(In reply to vladvitan from comment #1)
> I want to work on this. Could you please give me a starting point for this?
> Should I use the toHash() functionality from druntime?

Yes, or you can use typeid(var).getHash(&var).

You'll have to put this inside of a trusted lambda in order for it to be @safe.

The main thing you need to make sure is that it follows the logic of opEquals,
i.e. two things have the same hash according to opEquals' logic.

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