[Haskell-beginners] How to call popCnt64#?

[John Ky]

Hello Haskellers,

Does anyone know how to call popCnt64# from the GHC.Prim module?

This was my failed attempt:

λ> popCnt64# 1


<interactive>:14:11:
Couldn't match kind ‘*’ with ‘#’
When matching types
a0 :: *
Word# :: #
Expected type: Integer -> Word#
Actual type: Integer -> a0
In the first argument of ‘popCnt64#’, namely ‘1’
In the expression: popCnt64# 1
In an equation for ‘it’: it = popCnt64# 1

-John
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