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Add an Eq instance on GHC 8.6+ #47

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int-index opened this issue Aug 2, 2018 · 2 comments
Closed

Add an Eq instance on GHC 8.6+ #47

int-index opened this issue Aug 2, 2018 · 2 comments
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@chshersh
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@int-index
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GHC 8.6 offers quantified constraints, meaning we can try to do something like this:

instance (forall a. Typeable a => Eq (f a)) => Eq (TypeRepMap f)
@chshersh
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chshersh commented Aug 3, 2018

@int-index Could you recommend good tutorial on QuantifiedConstraints?

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https://ryanglscott.github.io/2018/06/22/quantifiedconstraints-and-the-trouble-with-traversable/

Here's a three-part blog post series on QuantifiedConstraints from Ryan Scott.

@chshersh chshersh self-assigned this Aug 20, 2018
@vrom911 vrom911 added this to To do in #2: Hacktoberfest (October, 2018) via automation Sep 30, 2018
@vrom911 vrom911 added the Hacktoberfest https://hacktoberfest.digitalocean.com/ label Sep 30, 2018
@chshersh chshersh removed the Hacktoberfest https://hacktoberfest.digitalocean.com/ label Nov 7, 2018
@chshersh chshersh self-assigned this Mar 27, 2019
chshersh pushed a commit that referenced this issue Mar 27, 2019
[#47] Add Eq instance to TypeRepMap using QuantifiedConstraints
58d6775 
Resolves #47
@chshersh chshersh mentioned this issue Mar 27, 2019
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vrom911 pushed a commit that referenced this issue Mar 27, 2019
@chshersh @vrom911
[#47] Add Eq instance to TypeRepMap using QuantifiedConstraints (#72)
449d597 
* [#47] Add Eq instance to TypeRepMap using QuantifiedConstraints

Resolves #47

* Fix tests on old GHCs
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