[#765] Support MAP over option
Description
Problem: Ithaca introduced another use for MAP instruction, namely it can apply to 'option' types, with the same semantics as Haskell's 'fmap'.
Solution: Add 'TOption' to 'MapOp' and 'Maybe' to 'MapOpHs'. Update typechecker. Add 'instance SingI1 'TOption'
Related issue(s)
Resolves #765 (closed)
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Edited by Nikolay Yakimov