<div dir="ltr">I'm also weakly inclined against it.<div><br></div><div>If we decided we really wanted something, then building a class that was just for this purpose might work, sort of an updated version of the old 'Error' class from transformers, but now limited to just the failure string so it has no extra baggage.</div><div><br></div><div>On the other hand, that then faces inertia problems all its own.</div><div><br></div><div>-Edward</div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 24, 2018 at 11:42 PM David Feuer <<a href="mailto:david.feuer@gmail.com">david.feuer@gmail.com</a>> wrote:<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>