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After [ https://ghc.haskell.org/trac/ghc/ticket/9220](https://ghc.haskell.org/trac/ghc/ticket/9220) changed the UArray role to nominal, one has to manually create instances (see [ http://stackoverflow.com/a/40988667/69663](http://stackoverflow.com/a/40988667/69663) for an example). |
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After [ https://gitlab.haskell.org/ghc/ghc/issues/9220](https://gitlab.haskell.org/ghc/ghc/issues/9220) changed the UArray role to nominal, one has to manually create instances (see [ http://stackoverflow.com/a/40988667/69663](http://stackoverflow.com/a/40988667/69663) for an example). |