Ah, I had never used pattern synonyms before, and I did not really that pattern synonyms could be bidirectional. That's good to know. It seems like mkTrApp should be removed then unless there are any restrictions on partially applying pattern synonyms. Sent from my iPhone

On Apr 14, 2017, at 11:51 PM, David Feuer wrote:

Yes, I believe you are correct that mkTrApp is safe, and probably should not be exported by Type.Reflection.Unsafe. However, it's not so clear to me that it should be exported by Type.Reflection. You should just be able to use App, both to construct and deconstruct type applications.

David

On Fri, Apr 14, 2017 at 8:02 PM, Andrew Martin wrote:

...

I've been playing around with the GHC 8.2 release candidate. In Type.Reflection.Unsafe, there's a really handy function named mkTrApp. Everything else in that module is pretty evidently unsafe, but I'm not so sure about mkTrApp. I'm wondering if it should actually be exported by Type.Reflection instead or if I've missed some way it could be used to create an ill-kinded TypeRep.

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