Thanks.   But where is this Cabal-syntax directory?   How do I "bump the
cabal version"?

I'm only trying to build GHC!  I wasn't intending to modify cabal.

Simon

On Sun, 15 Mar 2026 at 17:26, Brandon Allbery <[email protected]> wrote:

> It goes in `Cabal-syntax/src/Language/Haskell/Extensions.hs`, in `data
> KnownExtension`. The parse table is built from the constructor names, and
> `No` prefixes are handled automatically. Note that you'll need to also bump
> the `cabal-version` (file format version) and add an entry to the file
> format documentation (`doc/file-format-changelog.rst`).
>
> On Sun, Mar 15, 2026 at 1:18 PM Simon Peyton Jones via ghc-devs <
> [email protected]> wrote:
>
>> Friends
>>
>> As part of the reinstallable base project I'm adding an
>> extension "ImplicitKnownKeyNames" to GHC.  But if I put
>> "NoImplicitKnownKeyNames" in base.cabal.in I get the error
>>
>> Warning: [unknown-extension] Unknown extensions: NoImplicitKnownKeyNames
>>
>> when building the base library.  I think this comes from cabal.
>>
>> How can I tell cabal about the new extension?
>>
>> Thanks
>>
>> Simon
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>
>
> --
> brandon s allbery kf8nh
> [email protected]
>
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