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The `CCall' module defines the classes `CCallable' and `CReturnable',
along with instances for the primitive types (`Int', `Int#', `Float',
`Float#' etc.) GHC knows to import this module if you use `_ccall_',
but if you need to define your own instances of these classes, you
will need to import `CCall' explicitly.
More information on how to use `_ccall_' can be found in Section
section Calling C directly from Haskell.
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