3 Constructors for `ForeignObj' not visible when checking `PrelGHC.CCallable' instance
4 (Try either importing ForeignObj non-abstractly or compile using -fno-prune-tydecls ..)
7 No instance for: `PrelGHC.CCallable ForeignObj'
8 arising from an argument in the _ccall_ to `c', namely `x', at cc002.hs:18
11 No instance for: `PrelGHC.CReturnable ForeignObj'
12 arising from the result of the _ccall_ to a, at cc002.hs:10
15 Compilation had errors