BoxedRep UNPACK pragma

[Alan & Kim Zimmerman]

I have seen the following warning on master for some time

compiler/GHC/Core/TyCon.hs:1540:5: warning:
    • Ignoring unusable UNPACK pragma
        on the first argument of ‘BoxedRep’
    • In the definition of data constructor ‘BoxedRep’
      In the data type declaration for ‘PrimRep’
     |
1540 |   | BoxedRep {-# UNPACK #-} !(Maybe Levity) -- ^ Boxed, heap value
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Is it something that needs to be fixed? Can the code be updated to remove
the warning?

Alan
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