Simon,

notice that what you see is just a warning. Cabal will still pass the extension 
to GHC when compiling the package.

Andrea

On Mon, 16 Mar 2026, at 1:17 AM, Simon Peyton Jones via ghc-devs 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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--
Andrea Bedini
https://www.andreabedini.com


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