[Issue 17206] [Tracking] Check 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

--- Comment #4 from Steven Schveighoffer <schveiguy at yahoo.com> ---
(In reply to Steven Schveighoffer from comment #3)

>     bool[S1!true] aa2;
>     aa2[S1!true("hello".idup)] = true;
>     aa2[S1!true("hello".idup)] = true;
>     assert(aa2.length == 1); // fails
> }

The assert isn't telling the right story, really it should be that none of the
keys are equal to each other. This is a better example:

auto s1 = S1!true("hello".idup);
auto s2 = S1!true("hello".idup);
assert(s1 == s2)
aa2[s1] = true;
aa2[s2] = true;
assert(aa2.length == 1);

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