Availability of Coercible Instances at TH Runtime

Richard Eisenberg rae at cs.brynmawr.edu
Mon May 7 14:14:30 UTC 2018

Yes: https://ghc.haskell.org/trac/ghc/wiki/TemplateHaskell/Introspective
I think this may be waiting for the trees-that-grow work to be completed, and as far as I know, no one is actively working on this. But I still think it would be a Good Thing.


> On May 7, 2018, at 12:37 AM, David Kraeutmann <kane at kane.cx> wrote:
> Tangentially related, but wasn't there a plan at some point to integrate TH more tightly with GHC?
> On 5/7/2018 4:39 AM, Richard Eisenberg wrote:
>> No, it doesn't, but the Q monad is actually a wrapper around TcM, the type-checker monad. I don't think it would be all that hard to do this. Could be a suitable project for someone new to GHC hacking...
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