Disable messages with GHC API

[Matthew Pickering]

The errors are eventually caught and printed by "handleSourceError"
which is used a few times in your code. You could either modify one of
these to not print out any errors or try something more intelligent
like is in `parUpsweep_one` which does use the `log_action` in order
to print the errors out.

On Fri, Feb 3, 2017 at 12:21 PM, Christopher Done <chrisdone at gmail.com> wrote:
> In Intero, after loading modules, for each one I run the following
> function: https://github.com/commercialhaskell/intero/blob/300ac5a/src/GhciInfo.hs#L75..L85
>
> If there are warnings or any output, they get outputted. As they are
> already outputted by regular :load, I don’t need the same output
> twice.
>
> How do I disable non-severe output for any GhcMonad m => m a? I’m
> using GHC 8.0.1 presently.
>
> I tried the following before calling getModInfo, expecting there to be
> no output anymore:
>
> +      GHC.setSessionDynFlags
> +        df {log_action = \ref dflags severity srcSpan style msg -> return ()}
>
> And this had no effect. I tried some other things but ran out of
> patience to keep a record of them all.
>
> Ciao!
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