[ghc-9.10-rc] foldl' ambiguities in several packages

[Teofil Camarasu]

Hi Shayne,

I think this is expected. Most of these packages have patches merged but
maybe they just lack releases?

This is the associated CLC proposal:
https://github.com/haskell/core-libraries-committee/issues/167

Cheers,
Teo


On Fri, 10 May 2024, 13:33 Shayne Fletcher, <shayne.fletcher.50 at gmail.com>
wrote:

> using the ghc-9.10 release candidate, at least all of text-short,
> unordered-containers and vector-stream fail to compile with ambiguities
> around the export of symbol `foldl'`. example:
> ```
> unordered-containers> [1 of 8] Compiling Data.HashMap.Internal.Array
> unordered-containers>
> /private/var/folders/rj/q93vlym52875_k7nwz_c3wth0000gn/T/stack-da6d6d11ecd50280/unordered-containers-0.2.19.1/Data/HashMap/Internal/Array.hs:66:7-12:
> error: [GHC-87543]
>
> unordered-containers>     Ambiguous occurrence ‘foldl'’.
> unordered-containers>     It could refer to
> unordered-containers>        either ‘Prelude.foldl'’,
> unordered-containers>               imported from ‘Prelude’ at
> Data/HashMap/Internal/Array.hs:(97,1)-(98,48)
> unordered-containers>               (and originally defined in
> ‘ghc-internal-9.1001.0:GHC.Internal.Data.Foldable’),
> unordered-containers>            or ‘Data.HashMap.Internal.Array.foldl'’,
> unordered-containers>               defined at
> Data/HashMap/Internal/Array.hs:380:1.
> unordered-containers>    |
> unordered-containers> 66 |     , foldl'
> unordered-containers>    |       ^^^^^^
> ```
> so far i've found all such errors can be overcome by qualification at the
> export site but is this expected?
>
> --
> Shayne Fletcher
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