Hi Henning,

GHC-10.1 still ships a new major release of `base`, so we will still need to bump `base` bounds concurrently with this upgrade for now. But the efforts of the reinstallable base project have meant that it is more and more viable to have one version of `base` that supports more versions of GHC. We haven't made of release of `base` that has this property yet though.

It might be possible to release a minor version of GHC-9.14's base that is compatible with GHC-10.1.

For more details see: https://blog.haskell.org/making-ghc-upgrades-easy/
Note that the known names patch will be in 10.2, and that will make everything much easier.

Cheers,
Teo

On Fri, 18 Sep 2026, at 9:45 PM, Henning Thielemann wrote:

On Fri, 18 Sep 2026, Zubin Duggal wrote:

> Given the many changes in this major release, we would very much 
> appreciate testing on downstream workloads.

I started to compile a bunch of my packages. I run immediately into 
version bounds issues with respect to "base". It seems that making "base" 
a library independent from GHC is not yet part of GHC-10.0?
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