g (F# f) =
let w = W32# (unsafeCoerce# f)
Why does GHC even accept this code?
I think unsafeCoerce# is not intended to be able to coerce unboxed values.
Prelude GHC.Base> :t unsafeCoerce# unsafeCoerce# :: forall b a. a -> b
The type variables a and b are supposed to be of kind *, and f is of kind #.
If we have any other function of type a -> b, for example
foo :: a -> b foo _ = undefined
Then GHCi rejects "foo 1.0#" and prints:
<interactive>:1:4:
Couldn't match kind `*' against `#'
When matching the kinds of `t :: *' and `Float# :: #'
Expected type: t
Inferred type: Float#
In the first argument of `foo', namely `1.0#'Cheers,
Wolfgang
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