<div dir="ltr"><div dir="ltr"><div>What about?:</div><div><br></div><div>instance Read e => MonadFail (Either e) where<br> fail = Left . read<br></div></div></div><br><div class="gmail_quote"><div dir="ltr">2018년 10월 25일 (목) 오후 12:42, David Feuer <<a href="mailto:david.feuer@gmail.com">david.feuer@gmail.com</a>>님이 작성:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">FWIW, I think I'm weakly opposed. Either is Haskell 98. MonadFail is<br>
solidly "standards-track" material, to the extent that designation is meaningful<br>
at the moment. IsString ... isn't.<br>
On Wed, Oct 24, 2018 at 10:44 PM Daniel Bergey <<a href="mailto:bergey@alum.mit.edu" target="_blank">bergey@alum.mit.edu</a>> wrote:<br>
><br>
> Is there still consensus in favor of adding this instance?<br>
><br>
> instance IsString str => MonadFail (Either str) where<br>
> fail = Left . fromString<br>
><br>
> In 2016 there was some discussion, and my reading is that there was consensus in favor at the time:<br>
> Trac: <a href="https://ghc.haskell.org/trac/ghc/ticket/12160" rel="noreferrer" target="_blank">https://ghc.haskell.org/trac/ghc/ticket/12160</a><br>
> libaries mailing list: <a href="https://mail.haskell.org/pipermail/libraries/2016-August/027248.html" rel="noreferrer" target="_blank">https://mail.haskell.org/pipermail/libraries/2016-August/027248.html</a><br>
><br>
> Does anyone know of a later decision not to add it, or was it simply no one's top priority?<br>
><br>
> What is the next step to move this proposal forward? Is more discussion in order? Should I just submit a patch?<br>
><br>
> Thanks,<br>
> bergey<br>
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</blockquote></div>