Alex generates code with unqualified imports, e.g. of `GHC.Exts`

[andreasabel]

jukebox-0.5.4 broke with GHC 9.4 because a new export Symbol form GHC.Exts clashes with a user-defined identifier of the same name. This is pretty bad, as it is inconvenient for the user to work around this.

• jukebox-0.5.4 lack proper bounds for its dependencies nick8325/jukebox#6 (comment)

Unqualified imports in generated code are just a ticking time bomb. It makes packages using Alex brittle. (And there is no material need for unqualified imports.)

The way forward here is to change Alex so that all its identifiers it imports are used qualified, so that there is no risk of clashing with user-defined identifiers.

See a parallel effort in BNFC:

• Make backends more resilient against keyword and Prelude clashes BNFC/bnfc#278