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Does GHC implement any kind of extensible records?

April 26, 2017extensible GHC implement records

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Does GHC implement any kind of extensible records?

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No, extensible records are not implemented in GHC. Hugs implements TRex, one extensible record variant. The problem is that the record design space is large, and seems to lack local optima. And all reasonable variants break backward compatibility. As a result, nothing much happens.