[GHC] #9628: Add Annotations to the AST to simplify source to source conversions

[Alan & Kim Zimmerman]

Ok, then I think the middle ground is keyword-specific annotations, as
proposed by Neil.

What should happen is that the raw annotations are used by a tool layer
such as ghc-exactprint or HaRe, and other more casual users will not have
to worry about the internal detail.


On Fri, Oct 10, 2014 at 9:13 PM, GHC <ghc-devs at haskell.org> wrote:

> #9628: Add Annotations to the AST to simplify source to source conversions
> -------------------------------------+-------------------------------------
>               Reporter:  alanz       |            Owner:  alanz
>                   Type:  feature     |           Status:  new
>   request                            |        Milestone:
>               Priority:  normal      |          Version:  7.9
>              Component:  Compiler    |         Keywords:
>             Resolution:              |     Architecture:  Unknown/Multiple
>       Operating System:              |       Difficulty:  Unknown
>   Unknown/Multiple                   |       Blocked By:
>        Type of failure:              |  Related Tickets:
>   None/Unknown                       |
>              Test Case:              |
>               Blocking:              |
> Differential Revisions:  D297        |
> -------------------------------------+-------------------------------------
>
> Comment (by simonpj):
>
>  I don't have data, but people are already complaining about the amount of
>  code generated by data type declarations #9669.  Have you counted how many
>  data constructors there are in `HsSyn`?  It's a LOT.
>
>  It just feels like a sledgehammer to crack a nut.
>
>  Simon
>
> --
> Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9628#comment:21>
> GHC <http://www.haskell.org/ghc/>
> The Glasgow Haskell Compiler
>
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