| We've discussed support for generic programming of the GHC AST before.
| Is there any chance we could move further on this topic by providing
| Data and Typeable instances for HsSyn either directly in the ghc
| package or in a boot library?

I'm not against that.  If we do it, we should do it in HsSyn itself; that will 
avoid orphan instances, and a boot library gets compiled in regardless so we 
are stuck with the code size increase.

Simon

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