Add instance of MonadHandler and MonadWidget for ExceptT

[Dridus]

I noticed there aren't any lifting instances for ExceptT like there are for ErrorT. Hopefully it's uncontroversial to add them, but let me know if I should approach this with a different process.

[snoyberg]

There's a build failure with GHC 7.8.4. Can you either use CPP to avoid those instances on older transformers, or use transformers-compat?

[Dridus]

Ah whoops, sorry about that. I pushed a new commit which makes them conditional on __GLASGOW_HASKELL__ >= 710, hopefully that's acceptable.

[snoyberg]

The condition should really be on the transformers package itself, not GHC.
It is possible to force different versions.

On Thu, Sep 22, 2016, 8:01 PM Ross MacLeod notifications@github.com wrote:

Ah whoops, sorry about that. I pushed a new commit which makes them
conditional on GLASGOW_HASKELL >= 710, hopefully that's acceptable.

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[Dridus]

okay, I'll change it to MIN_VERSION_transformers(0,4,0). I didn't previously realize that was possible.

[Dridus]

okay, I think this latest commit addresses that. let me know if it's suitable

[snoyberg]

Thanks!