package p
import "C"
//export F
func F(x *[10]C.int) {}

$ go build issue10889.go
# command-line-arguments
./issue10889.go:6:11: Go type not supported in export: [10]_Ctype_int
./issue10889.go:6:11: Go type not supported in export: [10]_Ctype_int

We can't support [10]_Ctype_int as argument, that's for sure, but why
can't we support *[10]_Ctype_int as argument?

I imagine one reason is probably that the C pointer to array layout and
Go's are incompatible, but I don't think that is the case today. Now people
need to resort to passing pointers to Go exported functions, but that also
assumes that the array layout is compatible between C and Go.