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T14561.hs:12:9: error:
Cannot use function with levity-polymorphic arguments:
unsafeCoerce# :: a -> a
(Note that levity-polymorphic primops such as 'coerce' and unboxed tuples
are eta-expanded internally because they must occur fully saturated.
Use -fprint-typechecker-elaboration to display the full expression.)
Levity-polymorphic arguments: a :: TYPE r
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