Re: [Haskell-cafe] Any precedent or plan for guaranteed-safe Eq and Ord instances?

* Stijn van Drongelen [2013-10-02 15:46:42+0200]

I do think something has to be done to have an Eq and Ord with more strict laws.

* Operators in Eq and Ord diverge iff any of their parameters are bottom.

This outlaws the Eq instances of lists, trees, and other (co)recursive types. Furthermore, in this formulation, even Eq for tuples is illegal, because (undefined, something) == somethingElse is going to diverge. Roman