Implement Semigroup and Monoid instances for the ST monad
Since IO implements Semigroup and Monoid, is there a good reason for ST not to implement those, too? I discovered the lack of those instances while using foldMap for code that used to use IO as the underlying monad.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.2.1 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Core Libraries |
| Test case | |
| Differential revisions | |
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| Blocking | |
| CC | |
| Operating system | |
| Architecture |