Using GHCi to load a module without access to its source code

I create a simple module, TestModule.hs, which contains a single exported top-level definition testval = 2. I compile it, creating TestModule.o and TestModule.hi. I delete TestModule.hs. I the开发者_如何学编程n load TestModule.o in ghci, like this:

~ λ ghci TestModule.o
GHCi, version 7.0.3.20110517: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Loading object (static) TestModule.o ... done
final link ... done
Prelude>

As you can see, TestModule isn't in scope and I cannot access testval. Why? How can I accomplish this without access to the source file?

Additional question: how do I accomplish the same thing using the hint package?

Thanks!

You can't interpret something that's already been compiled. If you want to interpret it, you need the source. You can make a package, if you like. Instructions are here.