Missing instance Eq (HashTable s k v)

[ekmett]

You can compare STRefs for equality, so you can have an Eq instance that checks to see if two HashTable s k v are the same hashtable. I wound up needing this, but can't write the isntance from outside of the package.

The instance does the only thing such an instance could do. It obviously can't compare the contents, and works just like when you compare STRefs or IORefs for equality.