Status of Data.List compatibility warning

There is currently a warning implemented in -Wcompat which warns you when importing Data.List in a non-qualified manner.

A.hs:3:8: warning: [-Wcompat-unqualified-imports]
    To ensure compatibility with future core libraries changes
    imports to Data.List should be
    either qualified or have an explicit import list.
  |
3 | import Data.List
  |        ^^^^^^^^^
Ok, one module loaded.

GHC ticket: #17244 (closed) CLC discussion: https://groups.google.com/g/haskell-core-libraries/c/q3zHLmzBa5E

This warning was implemented as part of the migration to making Data.List monomorphic again (and to be used like Data.Set, Data.Map etc). That doesn't seem like it happened, and I imagine that the current CLC would require a new proposal anyway in order to do that now. It's not clear in any case what "future core libraries changes" we are waiting to happen before this warning can be removed.

Therefore, I propose to remove this warning and to "start again" with a transition plan if people want to modify Data.List in some manner.

This is now motivated because ghc-internal is split from base we want to remove base as a wired-in package (so there is potential for it to be reinstalled).