Type-level error messages

[Adam Sandberg Eriksson]

When you pulled the latest version from git did you pull both arcanist
and libphutil? I think I saw a similar error when I missed one. Also
`arc upgrade` should do the right thing for you (in the future).

~adam


On Thu, 29 Oct 2015, at 09:23 PM, Iavor Diatchki wrote:
> Hello,
>
> I've updated the implementation to match the discussion from this
> morning.  The idea is that `TypeError msd` is a type-family that can
> never be reduced, similar to `Any`.  We don't do anything special in
> the constraint solver, however when printing errors, if we encounter
> any constraints of the form:  * TypeError msg  * TypeError msg ~
> Something  * Something ~ TypeError msg
>
> Then we evaluate `msg` and use it as the error message.
>
> This is fairly simple, and appears to work quite well.  The
> implementation is on branch `wip/custom-type-errors`
> (https://github.com/ghc/ghc/tree/wip/custom-type-errors).
>
>
> == Arc Difficulties Below ===
>
> I tried to update the Phabricator patch but failed.  This is
> what I did:
>
> 1. arc diff master --update D1236 --head custom-type-errors
>
> Exception ERR-CONDUIT-CALL: API Method "differential.creatediff" does
> not define these parameters: 'arcanistProject'. (Run with `--trace`
> for a full exception trace.)
>
> 2. I thought that maybe I need to update `arcanist`, so I pulled the
>    latest version for git.
>
> 3.arc diff master --update D1236 --head custom-type-errors
>
> Exception Failed to load class or interface 'PhutilClassMapQuery': the
> class or interface 'PhutilClassMapQuery' is not defined in the library
> map for any loaded phutil library. If this symbol was recently added
> or moved, your library map may be out of date. You can rebuild the map
> by running 'arc liberate'. For more information, see:
> http://www.phabricator.com/docs/phabricator/article/libphutil_Libraries_User_Guide.html
> (Run with `--trace` for a full exception trace.)
>
> 4.arc liberate
>
> Exception Failed to load class or interface 'PhutilClassMapQuery': the
> class or interface 'PhutilClassMapQuery' is not defined in the library
> map for any loaded phutil library. If this symbol was recently added
> or moved, your library map may be out of date. You can rebuild the map
> by running 'arc liberate'. For more information, see:
> http://www.phabricator.com/docs/phabricator/article/libphutil_Libraries_User_Guide.html
> (Run with `--trace` for a full exception trace.)
>
>
> Any advice on what I am doing wrong?
>
> -Iavor
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> On Wed, Oct 28, 2015 at 10:17 AM, Iavor Diatchki
> <iavor.diatchki at gmail.com> wrote:
>> I have also written my thoughts on the questions posed by Richard on
>> the wiki page.
>>
>>
>>
>>
>> On Wed, Oct 28, 2015 at 7:07 AM, Richard Eisenberg
>> <eir at cis.upenn.edu> wrote:
>>>
>>>
On Oct 28, 2015, at 10:02 AM, "Augustsson, Lennart" <Lennart.Augustsson at sc.com> wrote:
>>>
>>>
> I've put in my answers to your questions.
>>>
>>> And I've responded.
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> ghc-devs mailing list ghc-devs at haskell.org
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