Agreed! On Wed, Oct 3, 2018 at 5:13 PM David Feuer wrote:

A PR to add the instance for sequences would be accepted promptly.

On Wed, Oct 3, 2018, 12:51 PM lennart spitzner wrote:

...

Hi,

While the impact seems low, some relatively trivial MonadFail instances seem to be missing still, including: Option, First, Last, Proxy, WrappedMonad. Also the non-base containers:Seq. These were not specifically discussed either [1].

Thoughts? Any other things that are still overlooked?

-- lennart

[1] https://prime.haskell.org/wiki/Libraries/Proposals/MonadFail#Discussion

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