Relax requirements on hidden modules in GHCi

Motivation

I'm working on debugging something at work, and I've built up a decent amount of local state in GHCi. I need to check how Aeson encodes/decodes something, so I write:

λ> import Data.Aeson

and I get back:

λ> import Data.Aeson

<no location info>: error:
    Could not load module ‘Data.Aeson’
    It is a member of the hidden package ‘aeson-1.4.2.0’.
    You can run ‘:set -package aeson’ to expose it.
    (Note: this unloads all the modules in the current scope.)

I need to blow away my GHCi session, edit my cabal file, re-enter the REPL, re-build my context, all so I can import and use some functions that GHC knows exists.

Proposal

I'd like to turn that error into a warning in GHCi. If you try to import a module that GHC knows about, but it is "hidden", then GHCi should be able to import it. This'll make GHCi much more useful for exploratory work.