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Restrictions regarding how non-value types can be used have
generally not been enforced explicitly, depending instead on
the fact that the compiler wouldn't attempt to use them in
strange ways like offering a method type as a type argument.
Since users can now create most types from scratch, it has
become important to enforce the restrictions in a more
direct fashion.
This was a lot harder than it probably should have been
because there are so many types which go unmentioned by the
specification. Hopefully a useful exercise in any case.
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