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[PoC] Allowing ad hoc aliasing of an or pattern of literals into a polyvariant#7801
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Now that the runtime represenation of polyvariants is stable and well defined, we can allow aliasing or patterns of literals into a polyvariant if we want, since we can guarantee that if it matches it has been refined to the provided runtime representation.
Example:
Notes
For the implementation, we might need to check extra that the literals are valid as polyvariant constructors.