Add `MonadPlus IO` and `Alternative IO` instances
Cloned and adapted from #9588:
The following 2 instances are currently Orphans in transformers but shall be defined in base instead:
instance MonadPlus IO
instance Alternative IOThis proposal by SPJ already passed the CLC back in April and only needs implementing. I'll submit a patch shortly to Phab
This needs coordination w/ Ross as transformers must not define the same instances for new enough base versions.
Trac metadata
| Trac field | Value |
|---|---|
| Version | |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Core Libraries |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | core-libraries-committee@haskell.org, ekmett, hvr, simonpj |
| Operating system | |
| Architecture |