GHC Handbook

Note [mkWWstr and unsafeCoerce]

GHC/Core/Opt/WorkWrap/Utils.hs:843 compiler 1 ticket 

By using unsafeCoerce, it is possible to make the number of demands fail to
match the number of constructor arguments; this happened in #8037.
If so, the worker/wrapper split doesn't work right and we get a Core Lint
bug.  The fix here is simply to decline to do w/w if that happens.

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