[GHC] #16273: Hadrian turns on `-Wno-unused-imports` for text when using integer-simple

[GHC]

#16273: Hadrian turns on `-Wno-unused-imports` for text when using integer-simple
-------------------------------------+-------------------------------------
           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.6.3
  (Hadrian)                          |
           Keywords:  newcomer       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 In `Settings.Warnings`, hadrian turns on `-Wno-unused-imports` for the
 `text` package when building with `integer-simple`.

 It would be good to fix `text` so we can remove this special case.

 1. Build GHC with `integer-simple` and `-Werror`
 2. Remove the special case for `text` in `Settings.Warnings`.
 3. Fix the warnings in `text` appropriately so the build finishes.
 4. Push the fix upstream and then update the submodule.

 This could also be debugged without having to build ghc by downloading an
 [https://gitlab.haskell.org/ghc/ghc/-/jobs/artifacts/master/download?job
 =validate-x86_64-linux-deb9-integer-simple integer-simple bindist].


 Also see: https://github.com/haskell/text/issues/250

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16273>
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