Commit ghc/ghc@74ad75e8
moved `unsafeCoerce#` from `GHC.Prim` to `Unsafe.Coerce`, making it
no longer possible to import `unsafeCoerce#` from `GHC.Prim` (or
`GHC.Base`, which reexported it). Sadly, a large number of Hackage
libraries obtain `unsafeCoerce#` by importing these modules instead
of `GHC.Exts`. As a result, all of these libraries need to be patched
to import `unsafeCoerce#` from somewhere else instead.