Context for typed holes

Simon Peyton Jones simonpj at
Fri Oct 23 07:22:23 UTC 2015

Indeed.  Please also do give concrete examples, so that we all talk about the same proposal.


From: ghc-devs [mailto:ghc-devs-bounces at] On Behalf Of Manuel M T Chakravarty
Sent: 23 October 2015 00:16
To: David Feuer
Cc: ghc-devs
Subject: Re: Context for typed holes

I think, this is a good point. Maybe you should make a ticket for it.


David Feuer <david.feuer at<mailto:david.feuer at>>:

Unless something has changed really recently that I've missed, the typed holes messages are missing some really important information: instance information for types in scope. When I am trying to fill in a hole, I look to the "relevant bindings" to show me what pieces I have available to use. Those pieces don't include contexts! Is there something fundamentally hard about adding this information? I'd only want instance information for type variables--providing it for concrete types would make too much noise. I'd also want information on equality constraints, of course.
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