D202: Injective type families

[Andrew Farmer]

I believe you do this with: arc patch D123456

The arcanist docs are handy:
https://secure.phabricator.com/book/phabricator/article/arcanist/

On Thu, Sep 18, 2014 at 9:38 AM, Simon Peyton Jones
<simonpj at microsoft.com> wrote:
> Dear GHC devs
>
> I'm sure I should know this, but if I want to build a Phab patch, to reproduce some issue (example below). How would I do that?
>
> If Phabs were branches in the GHC repo I could say
>         Git checkout phab/D202
>
> That would be cool.  I know how to do that.
>
> But I don't think they are.  So what do I do?
>
> Simon
>
> |  -----Original Message-----
> |  From: noreply at phabricator.haskell.org
> |  [mailto:noreply at phabricator.haskell.org]
> |  Sent: 18 September 2014 09:35
> |  To: Simon Peyton Jones
> |  Subject: [Differential] [Commented On] D202: Injective type families
> |
> |  jstolarek added a comment.
> |
> |  I made two important adjustments:
> |
> |  - first of all I removed the `result` from the parser and lexer.
> |  Instead of `result` I'm planning to use type variable introduced by
> |  the user for the result (as described in [[
> |  https://ghc.haskell.org/trac/ghc/wiki/InjectiveTypeFamilies#Proposal7
> |  | Proposal 7 ]] on the wiki.
> |
> |  - following Richard's suggestion I changed `InjectivityInfo` to
> |  contain `[Located name]` instead of `[LHsType name]`. But I keep
> |  getting "Not in scope" errors. When I try to compile:
> |  ```
> |  type family F a :: r | r -> a where
> |      F a = a
> |  ```
> |  I get errors that `r` and `a` are not in scope. According to my
> |  tracing line 1149 of RnSource.lhs is responsible for this. I looked at
> |  other code in this module and it seems to me that `bindHsTyVars`
> |  should bring these variables into scope when renaming `r -> a`. I have
> |  no idea why this does not happen. Simon, help?
> |
> |  Also, build error reported by Harbormaster is nonsense.
> |
> |  REPOSITORY
> |    rGHC Glasgow Haskell Compiler
> |
> |  REVISION DETAIL
> |    https://phabricator.haskell.org/D202
> |
> |  REPLY HANDLER ACTIONS
> |    Reply to comment, or !reject, !abandon, !reclaim, !resign, !rethink,
> |  !unsubscribe.
> |
> |  To: jstolarek, simonpj, austin
> |  Cc: goldfire, simonmar, ezyang, carter
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