On Wed, May 3, 2017 at 6:17 PM, Max Goldstein <[email protected]>
wrote:

> Building on Charles, how would this handle recursive union types?


This can be handled as a convention at compiler level.

A new restricted type variable could be created, let's call it "enumerable"
and only non-recursive, non-function types be "enumerable".
If an non-enumerable type is used, the compiler throws an error the same
way it throws an error if a non-comparable type is used as a Dict key.



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