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

Ah, that is helpful, thank you.

Simon

On Mon, 16 Mar 2026 at 03:57, Andrea Bedini <andrea@andreabedini.com> wrote:
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
_______________________________________________
ghc-devs mailing list -- ghc-devs@haskell.org
To unsubscribe send an email to ghc-devs-leave@haskell.org