[Haskell-cafe] Flag to recompile modules which had warnings

[Greg Horn]

>
> If you're going to fix all the warnings anyway, why not just use -Werror?


I'm not sure if this is ghci or emacs haskell-mode, but if I use -Werror in
my cabal file then any warnings will cause ghci to fail loading, and I
can't use helpful interactive features like `:t myFunction` or `print
someValue`.
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