I sent this to haskell-cafe, but there was no response.  On
stackoverflow there was no response either.  I'm trying one last time,
but adding ghc-users (which I should have done at the beginning!).
Surely it can't be that no one knows how to load modules in ghci?  I
know a lot of work was done to enable this, as in
https://ghc.haskell.org/trac/ghc/wiki/DynamicByDefault, it seems a
waste if no one actually knows how to use it!