[ghc-steering-committee] #632: Phased introduction of GHC2024

Adam Gundry adam at well-typed.com
Thu Feb 15 08:50:29 UTC 2024

Dear committee,

In #632, I propose amending the GHC2024 proposal to specify that the 
default language used by ghc/ghci when run directly will remain GHC2021 
for now, since changing to GHC2024 is not backwards compatible. (This 
does not affect Cabal packages either way, since Cabal specifies its own 



On the discussion thread, some people expressed a preference that GHC 
should default to the latest language edition anyway. There is also 
Richard's suggestion of wider changes of approach in #636. However, 
given that the GHC 9.10 fork date is fast approaching, introducing 
GHC2024 but not making it the default seems like the best short-term 
solution to me. We can always reassess our approach to this for future 
releases as part of the wider discussion.

If you object to the proposed approach, please speak up ASAP. Otherwise 
I plan to merge in a week or so.



Adam Gundry, Haskell Consultant
Well-Typed LLP, https://www.well-typed.com/

Registered in England & Wales, OC335890
27 Old Gloucester Street, London WC1N 3AX, England

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