Re: GHC 8 and Template Haskell

Here's a question, on top of this one: why don't we require template-haskell changes for most corresponding syntax changes? We tend to play catch up with template-haskell sometimes and it's relatively strange. I mean, in some sense, we could have said a while back "This needs another revision, please add template haskell support" and avoided it all. Richard has a better insight into this than I do, I'm sure, but it seems - to me, anyway - like template-haskell support is a reasonable bar for most surface-level syntax change to cross, before getting merged. My intuition tells me that, most of the time, a lot of us simply forget to make the changes, or ask for them in reviews, and so it goes. On Thu, Apr 14, 2016 at 1:12 PM, Ben Gamari wrote:

Iavor Diatchki writes:

...

Hello,

Now that "OVERLAPPING" and "OVERLAPPABLE" are pragmas on the instances, do we have a way to generate instances with such pragmas using Template Haskell? I can't seem to find a way to do this, which is unfortunate.

If I am not missing anything, would there be objections to adding it to the TH library before the next release---I would volunteer to do the change ASAP.

Indeed this is an unfortunate gap. Given that this shouldn't be a terribly invasive change I would be alright with this if Richard approves.

Cheers,

- Ben

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