ModuleInfo.minf_rdr_env not exposed

[Sam Halliday]

Thanks Artem,

I created a merge request at

  https://gitlab.haskell.org/ghc/ghc/merge_requests/1541

I wanted to target the 8.8 branch but I couldn't find anything except
master and that seems to be 8.9 already. If the reviewers are happy with
this, could they please cherry pick it to wherever it needs to go? I'd
also love to see it in 8.6 if there are any more releases as it would
mean no more workarounds in the downstream tool :-D


Artem Pelenitsyn <a.pelenitsyn at gmail.com> writes:

> Hey Sam,
>
> I think the thing you propose hardly qualifies as a new feature (in the
> sense of page you referenced), so not much of a hassle should be involved.
> As long as it is a 3-lines change, I'd say go ahead and create an Issue and
> an MR on Gitlab: you might be better off with getting feedback there.
>
> --Best, Artem
>
> On Tue, 6 Aug 2019 at 15:52, Sam Halliday <sam.halliday at gmail.com> wrote:
>
>> Hello,
>>
>> I would like to submit a patch to ghc 8.8 adding a function that exposes a
>> field that is useful for tooling authors and can already be reached, albeit
>> in a very awkward way.
>>
>> The process documented at
>>
>> https://gitlab.haskell.org/ghc/ghc/wikis/working-conventions/adding-features
>> seems very heavyweight for the patch that I was planning to propose,
>> which is just adding the following to GHC.hs (and exporting it):
>>
>>   modInfoRdrEnv :: ModuleInfo -> Maybe GlobalRdrEnv
>>   modInfoRdrEnv = minf_rdr_env
>>
>> Without this accessor, we must reparse and typecheck the file to get the
>> GlobalRdrElts, which is very inefficient and uses fields named "internal"
>> so I'm guessing that's not a good thing to build a tool on top of.
>>
>> My colleague already wrote a tool using a workaround, see
>> https://gitlab.com/tseenshe/hsinspect/blob/503cd48faba5b308be29ed44a12f7d6b22105f2b/exe/Main.hs#L53-61
>>
>> How should I go about submitting this? Do I need to write a test or is
>> this trivial enough not to bother?
>>
>> Sam Halliday <sam.halliday at gmail.com> writes:
>>
>> > Hi all,
>> >
>> > Is there a reason why minf_rdr_env (a field in ModuleInfo) is not
>> > exposed?
>> >
>> > It's possible to reconstruct it in 8.4.4 (the only version I'm looking
>> > at) with a TypecheckedModule via
>> >
>> >   let (tc_gbl_env, _) = GHC.tm_internals_ tmod
>> >       minf_rdr_env = tcg_rdr_env tc_gbl_env
>> >
>> >
>> > It's a useful thing to have for editor tooling (e.g. to get the correct
>> > qualified imported symbols that may be autocompleted).
>> >
>> > --
>> > Best regards,
>> > Sam
>>
>> --
>> Best regards,
>> Sam
>> _______________________________________________
>> ghc-devs mailing list
>> ghc-devs at haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>>

-- 
Best regards,
Sam
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